My 5.0 went out after 312,000 miles I replaced it with a 5.7 . The problem I am haveing is I dont have as much power as I did with the old motor . I havent changed the ecm program yet but I am tomorrow. GM said that they didnt have a prog. to fit my truck because they didnt make a truck with the same 4spd. auto and GU6 "342" rear gear with a 5.7 motor only the 5.0 in 98' but I found someone who is in the performance clik who can install a converted factory prog. ( I cant even power brake..lol ) I have been to 5 dealerships and paid for 3 diagnostics and no codes came up on computer over $300 and havent gotten any results! Half of them blame the old 5.0 prog. and half say it doesnt make a difference from a 5.0 to a 5.7 where the comp is concerned!! It has absolutely no lowend power and moderate mid and high end! Anyone ever been here before?!? Would appreciate any help!!
well yeah the computer would make a world of difference, if u hve a computer for a smaller engine in a larger engine, ur injectors arent sprayin all teh fuel the bigger engine needs, and a multitude of other things, get the right ecm and it should run alot better
98 ck 5.0 to 5.7 swap
