I am having an idle issue when sitting parked or with foot on brakes. My car is idling erraticly but on the lower end and my gas mileage is dropping. Also check engine light is on.

Asked by May 10, 2015 at 07:49 PM about the 2004 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

Just changed plugs and wires and air
filter. Plus work out of town so i drive
a lot bout every 3 tanks of gas i use
lucas fuel treat.

1 Answer

75,735

Have the computer scanned and post the trouble code(s). Most auto parts stores will do it for free. HTH. -Jim

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