What cylinder was the missfire, or cylinders?Was it missfiring at Idle?Need more info, because there are several bulletins for this problem. If it is a single cylinder missfire I want you to swap it with a good coil on the vehicle and see if it changes to that cylinder. If it does not we have to go in a different direction.04-06 colorado's had ALOT of cylinder head problems with the intake valves sticking causing a light missfire at idle. I've replaced ALOT of cylinder heads on these vehicles. Post back with what you find.
Saturday, December 20th, 2008 AT 9:51 PM