I have a 1990 firebird with a 3.1L
Im need to find out the correct fuel pressure, I get 35 psi
when I put a gauage on it.
The chiltons book says it should be between 40 -47 and
the Haynes book says it should be between 35 - 40.
the car is giving me code 44, lean mixture. It starts fine but has a miss.
I change the O2 sensor and the fuel filter.
and a tune-up
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