Not sure how to tell if it's a constant missfire. I changed all the spark plugs and it ran good for about 1 mile then it started to misfire and feel as though it was about to stall (it never did). When I parked it, I put my foot on the brake and put it in reverse and just sat there without moving, the whole car really shook and it sounded as though there was knocking sound in the back end. When I put the car in drive and sat still, it shook and idled at 1rpm with a lot of vibration. When I placed it in park it reved to 2 rpms and then came down to 1. I did recheck the spark plugs and they looked good.
When I researched the code online (P1641) the probable cause was "Open or Short circuit condition" and "Check for failed sensor".
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Saturday, November 17th, 2012 AT 4:41 PM