engine and sputtering problem

Asked by Feb 20, 2014 at 05:26 PM about the 1999 Pontiac Grand Prix 2 Dr GT Coupe

Question type: Maintenance & Repair

car idles at 2000 rpm
jerks when put in reverse
car dies after driven 5 to 10 feet
just preplaced egr valve,idle sensor, spark plugs
any ideas

2 Answers

2,815

Jerking when you put it in reverse could be due to bad motor mounts, especially the top front 2 motor mounts, but they are easy to change out. The high idle and engine dying could be an issue with the throttle, IAC (Idle Air Control) valve, or a vacuum leak from a hose or intake gasket. You might have a bad fuel pump resistor if there is low fuel pressure at low rpm.

9,405

It's jerking because the engine is idling way too high to switch into gear. Try not to shift it untill you get the RPM back down to 1200 or less, don't push the tranny. What was the car doing before the new parts were installed? Does it smell like it is flooding? Try starting it briefly and check the exhaust. I need to know if your running rich or lean to get closer to the problem.

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