[THEFERMANATOR]

My bet is the throttle body and IAC are carboned up. VERY common issue on trucks with over 100K miles, and is relatively easy and cheap to fix. Get you a can of carb cleaner or throttle body cleaner(there both about the same stuff, but carb cleaner is normally cheaper), remove the intake tube from the throttle body, open the throttle and spray the throttle body down and wipe it out real good with a rag to get all that black gunk out, and if you have some torx bits remove the IAC from the throttle body and spray it off and teh throttle body where it goes in to get as much of that black gunk out as you can. Also you may want to check the fuel pressure regulator out, but that normally causes issues with a hot start.