I was supose to be going to pick up a 1968 Poncho 400 punched .040 over with a 400 H.O.cam Highrise intake, Demon 750, 6X Heads and headers for my 70 LeMans Sport drop top with the truck this weekend. 88 454 Burb. Doesnt idle up like normal when you try to start. Once it strts it bobbles REAL bad like its firing on 4 cylinders Then it suddenly clears up throws the Check engine light but goes to warm idle speed. Here is the kicker. Its storing no codes but gives me the code 12 like its supose to. Testing it running its going closed loop like its supose to. Anyboy see this before? Book says the QUAD IC might cause these symptoms and my ECM is not protected so if something shorted out it would FRY the ECM. I have a spare ECM but got to do the diagnostice to make sure I don't smoke it too if thats what has happend. Anyway any pointers would be much appreciated. I don't have access to WinADSL so I'm doing paper clip diagnostics.