well my son came down today, took off the hoe and said that thing looks brand new, I said did you push ope n the choke and look in?? he did it and said WOW there the problem its loaded with crap! he used 2 cans of carb cleaner and cleaned everything. After that I started it up and got the cleaner o run thur, purrs like a kitten. Got on the highway and it has even more power!went to the zone and got some Lucas fuel injector cleaner, a big bottle enough for 30 gal of gas, put the hole thing in there and get that injection system clean. It says for carbon build up?
I looked at the air filter with my son it was ok but the zone did not have the one I needed. My son said thats not bad I have seen worse, I said it will be changed when I go by Advance this week, its a cheap replacement and I have seen some so plugged that the motor would not run, never mind the gas mileage, and I am getting 14 mph now!
Also every time I get gas the ck engine light comes on? I never leave the truck running when gassing up? So I got a new gas cap also and see if that helps? Light was on after we did the decarb, but I was betting that it was because of the cleaner and running like carp till I burned it up.
The real test is tomorrow morning and see if she runs good or still runs ruff on start up??
Now just a break job and she should be good!

I will let you know how she is in the morning!

THANKS GUYS!!!

MJ, I was getting 14 out of my 02 Suburban when i first got it, I had been running 15w-40 in it. Some one told me to use 5w-30 like the manual said, i switched over and started getting 16 mpg on my next trip. I then switched over to Mobil 1 5w-30 synthetic and on our last trip to Florida, I averaged 18-19 on the highway running far faster than i care to admit

same as spare, went to mobile one syn and picked up 2 mpg on the road. in town , no difference. also picked up a few oil leaks i did not have before.

Your a LUCKY man Spare. 15/40 in an LS engine was putting you in DANGEROUS territory with oil pressure. I bet it was hitting 100+ on a cold start. The LS engines are designed to hold GOOD oil pressure on 5W30 oil. As for your check engine light MJ, there is a bulletin about the fuel tank purge valve assembly back by teh tank. It sticks alot and causes teh check engine light quite often. Next time it happens run by autozone and get teh code number and I can let you know if that is it. The GM part to fix it is less than $40 if it is the purge valve, but changing it is a pain as it is up by the rear axle underneath.

Well it started this morning, and went right to high idle, but after a min or so started doing the same thing, but cleared up much faster then before also. So my son is going to do it again this week as it is snowing again now. We will see after the 2nd time if we can get it right//
Ferm I had that problem in my 02 truck and it was that purge thing, I had a friend change it and it was good after that,but the light would stay on all the time in that truck.. I am sure if its not fixed now that would be it, the ck light went off after a little while and has not come back on so far, we will see? Thanks for reminding me!
I am going to get a oil change this week, but when I had the other truck it also had the 4.8 and bot the same gas mpg.

My new question is I have called about getting breaks for the Tahoe and it has 4 wheel disc, they all ask me if it has one or two pistons, I will have to look to find out. But My other truck had 2 pistons, and I was wondering does it matter?? I would think the dual pistons would be better? So if I buy the dual instead of the single will they just fit in place of the single with out problems

Thanks guys!!

Pretty sure yours has dual pistons up front and singles in back, but you have to see what you have before you buy brakes.

hows that car going

Not very well Aussie, 2001 Tahoe 2WD 5.3L here, wife's wheels. Poor girl it is asking for another change of engine oil, radiator is leaking, then I went to drive it and it feels like the shock on the right rear is broke. I forget the miles around 95,000 ? The Service Engine Soon light stays lit all the time. Some odd Computer Code that is saying their is a problem with the computer. Runs and drives like a top. The light has been on so long I am surprised it hasn't burnt out. So I dropped it off at the repair shop next door. Now if I could get the seat re-upholstered while it is down I would be a hero..
BTW I started using Mobil One 5-30 Synthetic at around 40,000 miles. Then I switched back to regular motor oil at around 85,000 miles. No sign of leaks or burning it out the tailpipe but she now uses 1 Quart in between oil changes (3,500 to 4,000 miles.) Valve stem seals maybe..

Get me the code number, or swing it by as I have an ECM for it sitting on the shelf. I can flash that ECM to shut codes and such off, but I don't have all of the stuff here to do custom tunes for gassers(I don't have the money to spend on a wideband O2 sensor that I might use once every 2 years).

I may do that after fixing some of the other issues Ferm. If you were only closer you would have the entire job.
I think the plan is to keep it, I may need to upgrade the radio too. The sub isn't working and the speakers in front sound blown.