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So this was my original problem my car was idling really weird like it wanted to turn off but then the revs would go back up. The check engine light was on and the Code "P2251 02 sensor Negative Current Control circuit/open", 2 other codes P0030 "H02S Heater Control Circuit" and P068A "ECM/PCM Power Relay De Energized Performance- Too early". I do have a tune, headers and CAI. . I had the tune, headers, and CAI for over a month with no problems. At first I thought it was the tune but somebody recommended to replace the faulty 02 sensor. So I did replace the 02 and the codes never appeared again. But now I have the same problem with revs going up and down but now I have a P0308 code "Cylinder 8 Misfire".I can't drive the car like this because is surges and shakes. I really don't want to take it to the dealership because of the Mods I have. I was hoping it was the tune because thats an easy fix but at this point I don't think it is. Any Advice?
http://youtu.be/_DqrT5J2fVI
 

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vacuum lines, might be a surge issue, but the other stuff IDK, check your wires to the #8 cylinder you know pull the plug and ark it. that's all I could think of, I watched the video but there was no audio 9 (my computer) so I couldn't really tell what was going on but also check the plug for gapping.
 

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I would reflash the PCM. Have you changed to a different fuel lately? I messed around with E85 a bit and also got cylinder misfire codes. Didn't do that anymore. If you look up the code (google) it list the things. Plug, plug wire, coil pack, injector all the least serious and easiest to identify. More serious stuff like bad valve etc could be checked by a compression test. If you take to dealer I would reflash to stock. Who's tune are you running?
 

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So much for mods and now a $40,000 lawn jockey. Reload orig tune and take it back that's what warranties are for.
 
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