new engine

no i did not change any thing with the out drive. but i took it out today and got standed :'( i think that there is a major engine problem now because i could not go above 800 rpm with out it cutting out it took about 30 seconds for it to get on plane and i was not even geting 24 knots with two people onboard in front i think that there was somthing wrong with the engine when i had it installed and now it is showing. after i got on plane it sputtered and my wheel would jerk to the port side of the boat but i didn't hit any thing then it would not let me go above 800 rpm. i will have the mechanic look at it tomarrow and we will go from there.