2008 pontiac grand prix 3.5 rough idle?

C

Chris

New member
just started the other day, before i could step in to the pedal and very good throttle response and smooth power excelleration. the prob was the other day i started the car and could feel a little rough idle but not bad. but where you could really feel it was stepping on the pedal, it seems like there is nothing there until you press on the pedal harder. kinda like its missing a cylinder but it hasnt trown a code. did i just get a tank of bad gas? plugs? any help will be really appreceated!! cool site, iintro'd last month but havent posted yet!! thanks
 
three possibilities: bad fuel, plugs, or coil pack; you burn the gas and replace the plugs, and if it continues then its the coil pack. I take it in if you still have the warranty
 
That is a bit strange for a car as new as that. Take it out on the highway and burn a tank of gas. When you fill up the next time. Put in some premium gas, like 91 or 93 octane. A vacuum leak can also cause a rough idle. Maybe a vacuum hose slipped off somewhere. If it gets worse, then have the dealer look at it, it should be under warrenty, right?
 
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