It won't boost properly. The Guage only goes half way up and feels weak and almost like hesitates

Asked by Mar 15, 2016 at 09:23 AM about the 1999 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

Hi , I have a 1999 Grand Prix gtp that seems to not
be boosting correctly .... Why? I changed the plugs
the wires put a new catalytic converter on it . It feels
like a misfire kind of but then it feels like it's
something else at first I thought maybe the boost
gauge was broken ... Because when you get on it
and try take off . It only goes half way up any help
or suggestions greatly appreciated thank you .

1 Answer

3,775

Scan it for trouble codes. That will likely give you some guidance.

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