Hey guys Im new here and trying to help a friend out who just moved to Canada. He has a 1994 Yukon that used to have a 350 TBI. He has put in a 1990 454 with TBI. Hes done a great job except it has no guts. In park it runs and sounds great, slight chug in idle. Driving...now theres the problem. Driving down the road easy on the gas it seems ok. If you go wide open throttle it does kick down but the thing "chugs" like it wants to go but just doesnt have it. It goes faster but "chugging" like its missing or not enough fuel or something. Hoping some one here can help..I have a couple pictures of the engine bay. I am not sure how to post them on here though... Any and All help is appreciated. Thanks to those in advance