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Old 01-21-2015   #2
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Join Date: Aug 2013
Posts: 124

GTA Year: 1990
GTA Engine: 350 TPI Automatic
Re: Formula 89 TPI 5.7 problem

First thing I would do is check the fuel injectors. Make sure each injector is atleast 15-17 OHMs...
Then check fuel pressure, should be around 42 PSI with the vacuum line on the regulator off, and then the TPS located on the passenger side of the throttle body....
My car was acting similiar to the way you are describing your friends car and after replacing different things until finally someone told be to check my injectors. I found two injectors at 4 and 8 OHMs. Replaced the injectors and viola, car started and ran perfectly...
1990 Trans Am GTA
1982 Pontiac Firebird
1976 Trans Am
1995 LT1 Camaro
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