got my car together and up and running and she was runnin hard but had a lean back fire i put in a new cam 540 lift with port and ploished heads and ported intake to match. heads are seated to a 1.6 with crane gold rollers. new timing chain water pump gaskets full length headers 1 3/4 inch , Y pipe 3 inch all by Hooker, plugs wires opti spark and throttle boddy BBK 52mm. i went and got it tuned but when they ran it on the dyno they said i blew a head gasket. i ripped the top half aprt and sent my heads out to get inspected and there was nothing wrong with them and i checked the gaskets nothing wrong with them. My water pumped siezed. replaced it. went back and re dynoed and came out with a good first pull with no tunning involved 287 at rear and 418 lbs of torque they started tunning and next pull i was impressed i pulled 365 at rear torque numbers did not change. next pull my motor loaded up and they did not no what the problem was so i went to a mechanic and got his opinion. It was not running right after that i was pissed, it was idling at only 400rpm soumnded good but i know it was not. someone suggested MAS air, Cooling temp sesor TPI sensor? Anyone have any ideas ?

 

Might want to add the specifics, like year of the car. Not all LT1's are the same.

 

Its a 1994 lt1 with a turbo 350 tranny 3500 stall non locking. Do u have any suggestions INJUNEER

 

Since you suspect a fuel problem, did they have a wide-band on it when they were doing the dyno pulls? That would have shown up any fuel problems.