1.8L W/Service Stabilitrak & Traction Control, Flashing CEL, rough idle, etc. Help!
Got off work one day, hopped in, started my baby up, and she started all these crazy symptoms. I limped her home and parked her. Replaced the valve cover assembly and spark plugs, put her all back together, started her up... Same problem. Ran codes, got codes U0100 & P0304. Thought maybe I hadn't gapped spark plugs properly. Pulled them back out, checked the gap, .028. Ran codes, got the same result. Cleared those codes, I get a permanent P0300. Engine runs fine after ignition for about 30 seconds, then I get the service stabilitrak/tcs, and cel flashing-- engine starts rough idling. Checked all the lines, etc. Replaced the intake cam sensor... Replaced the champion spark plugs I just installed with AC Delco 41-122s, put it all back together. Same results.
The initial codes are U0100 and P0304. Once I clear those, I get P0300. I'm stumped. Faulty coil maybe?