I have a 2000 cadillac deville DTS with 70,000 miles on it. It will cold start and drive fine but after warm shut of sitting for 10-45 mins it will start up and run real rough. Check Engine lignt will flash and run poor for several miles and then: check engine light goes away and it will run great again. Code i get is P0300 multi cylinder misfire. It only does this if it sits warm for several mins, always cold starts fine and runs great. Is it a coil pack over heating problem, If so how do I check a coil pack. I have had it off, no cracks or visable problems.
Thanks for any help.
Thanks for any help.
May 7, 2007 at 12:15 PM