Black smoke loss of power rpms jump all over

Asked by GuruRDQ6 May 07, 2017 at 12:13 AM about the 2001 Pontiac Grand Prix GTP Coupe

Question type: Maintenance & Repair

I have a 2001 Pontiac grand Prix gtp
supercharged 3.8 liter v6 I have replaced the
IAC sensor tps sensor o2 sensors spark
plugs wires fuel filter and pump runs out of
gas at top of orange mark new mass air flow
sensor ecm new it still has the same
problem does anyone have the correct
answer of what exactly it is tired of wasting
money...Thanks

2 Answers
59,045

enginecreator answered 6 years ago

Check/test compression on all cylinders first and foremost to know if its worth any-more time/money. Running rich, fuel injectors may be dirty and to atomizing fuel any more.

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