Thread: Correct spark plugs 2006 grand prix. base model 3.8.

The car has 165000 miles, initially the car would start and either die or just about die, whether it was cold or warm. I decided to replace plugs and pcv valve. Put AP606 in and for the first 7 miles ran great. now it idles poorly and will stutter at hwy speed. Could it be the plugs? maybe go back to copper? Thanks for any suggestions.

apparently our igntion systems dont like platinum plugs.

Try iridium.

AC Delco 41-101 works well.

I can certainly pull them back out. I am handy with a wrench but its no fun job. Thanks.