when steping on the gas al the way the car starts to jerk like if something is letting it from not going fast at this moment the car only go


Asked by Nov 11, 2014 at 10:37 AM about the 2007 Pontiac Grand Prix GXP

Question type: Maintenance & Repair

At this moment the car only go half peddle if I press all the way it starts to jerk I took off the cat and cleared it out I cleaned injectors  and still does the same what can it be one of my friend says its the sparkplugs or the fuel pump. can you guys help me out asap plz?

4 Answers


gtp grand prix 07 3.800 supercharged

When you stomp on it the supercharger kicks in, and when I say stomp may be bad choice of words..just hit the throttle pretty good. Do you hear a squeal by any chance? That would be the belt on the supercharger straining to turn it. Check the oil in supercharger. It's not spark plugs, I looked it up and it has iridium plugs good for 100,000 miles. (unless you have put that many miles on the clock) And yes, if the fuel filter is clogged, (not pump) it is just starving for fuel ..positive pressure induction really demands a good fuel pressure


I'm leaning to what FordNut said change the fuel filter first then check the fuel pressure and flow. If the pump isn't up to specs replace it.

1 of 1 people found this helpful.

thanks ill check it out .

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