89 CSX 51K miles, all stock save for upgraded exhaust. Drove it to our local club meet last night about 40 miles, ran great-until I pull in the Applebee's parking lot It pops a CEL and starts running just a bit rougher and a hundred or so RPM's high at idle. So I quick right it into the AutoStoned parking spot in case I need some kinda part they won't have anyway, and check the codes. I get:
12
61
72
Then a series of flashes without delays or breaks, that's not really a discernable number Check them again, same thing. My first thought was bad ground somewhere and all I really checked with a flashlight are the 5 major ones which are all clean and intact. After we ate and drank the fine faire at the 'Bee's, I reset the SMEC started the car and it was right back to the CEL. Checked again and it's pretty much the same nonsense codes again? Car made it home no problem, WOT is just fine, good power, no hiccups. Anything else to check?