Question about 1999 Pontiac Grand Prix

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Car skips and chugs when first excelerating or up hills

We have changed plugs,wires, coil packs, and mass air flow sensor. The car still skips bad and feels like it wants to cut off but only when starting from a complete stop or using more "pedal" to get up hills. The check engine light comes on when it does this and will go off after driving awhile. What should we check next?

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  • 365 Answers

Catalytic converter or fuel pump.

Posted on Jul 27, 2009

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Skips when cold and ck engine lite is on.Spark plugs have been changed. Fuel injection cleaner added to gas. Code comes up multiple missfires.any Ideas on what to do next to fix?


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Well there are several things that could cause this problem...

1. one of the coils may not be firing.
2. the ignition module could be bad.
3. the mass air flow sensor could be tellign the car to run rich (too much gas)
4. if the car is equiped with a map sensor it could do the same as a mass air flow sensor.
5. fuel pressure regulator could be leaking at vacuum port drawing in more fuel than needed.
6. the computer itself could be bad as well.

The car either has a map sensor or mass air flow not both. The mass air flow would be right after the air cleaner housing usually a 4 wire connector. map sensor is normally located on the rear of the upper intake manifold with 1 vacuum line going to it with 3 wire connector. Hope this helps.

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If you had a bad mass air sensor, it should register a fault code. Ditto for oxygen sensors. I'd change the fuel filter for sure, as well as spark plugs (make sure they're gapped correctly), and run a bottle of Seafoam through the gas tank. If that doesn't do it, change your cap, rotor, and spark wires (all told you're under $100 for everything).

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