I have a 1991 GTA it has a 355 sbc with dart heads about 10:1 compression and a Howard's cam 219/225. It has tpi with a stock throttle body and 24# injectors. It ran steong for about 6 months until I took it to the drag strip and it vapor locked on the line. After letting it set for about an hour the car started right up and seemed to run fine and drove it home no problem. About 2 weeks after this I pulled the motor to change a few gaskets and delete the AC from my car. Since its back in I have had nothing but problems. At first I was getting poor spark in the 6 and 8 cylinder and it was causing it to bog really hard on take off and go very lean once it got moving but I put a new cap, rotor, plug wires and plugs in and now I'm getting good spark. Once all of that was taken care of it no longer bogs on take off but would after driving for a few minutes. I replaced the fuel filter thinking it could possibly have been the cause of it going lean and also that of my vapor lock problem in the early spring. After replacing it the car ran good for about 5 minutes until it puttered out and died. I checked for fuel pressure in the fuel rails and it had good fuel pressure. But now it will not stay running for more than 10 seconds.

Any advice would be greatly appreciated

 

Does sound like a starvation issue. How did you check the fuel pressure?

 

Static fuel pressure test, with leakdown time. Check vac supply to FPR - does it smell like gasoline? Leaking FPR bladder. Leaking injectors maybe?

 

i know how u feel. im having the same problem with my 92 firebird. starts up, almost dies, revs back up, almost dies, etc. then it shuts off completely

 

My 91 was doing this and it turned out to be the Coolant Temp Sensor and timing.