Ok first let me start out with my set up LS long block, jdm (LSD) gsr trans, light weight fly wheel stage 3 clutch, skunk 2 intake manifold, and skunk2 throttle body, keep in mind this is a obd1 engine converted obd2A and obd2A p75 ecu alright here is my problem im having i recently just bought this throttle body (68mm) before i installed the tb the car idled and ran fine reved up fine no problems or anything when i had changed out the tb the car idled fine and when i would hit the gas the car would not rev up it would choke and almost stall out in place. if i keep it floored the revs will get REALLY LOW!!! and back fire i changed out the tps thinking it went bad in the change over of tb's i measured the tps voltage on both tps's i have and both are getting the same reading 4.7 volts on both when i measure the 2 outer most wires. so its reading wide open when my tb is closed. but y r both sensors reading exactly the same false reading no clue. my guess was the comp. so im in the process of ordering a conversion harness to obd1 with a chipped p28 seeing if that will help but i dunno im hoping that some 1 has had the same problem and can help me out cause im pulling my hair out on this 1 i tried just bout anything and nothing wants 2 work

 

TPS and map sensor got switch around.

 

i tryed that and the car wouldnt even start

 

ground by the thermostats housing....the same thing happen to me check your ground and reset your ecu..check for cel its in limp mode....

 

found out the problem it wasnt a ground it was a defective ecu but thanks though