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Hi.
I have a 99 Sephia (98k miles). It's been running great up until yesterday. It was running fine for about 10 minutes then it started to bog and the check engine light came on. Now, I can barely get the old girl down the road.

Autozone checked the codes and came up w/ P0301, P0300, 261, 270 - the two that they can look up indicate that it is misfiring on at least 3 cyclinders. They don't think it's a sensor gone bad, but maybe a vacuum issue. I've checked the hoses and they all look fine. The wires and coils are creating a spark. I put some fuel injection cleaner in it and ran that threw a bit, but no such luck. Note: There is a TON of carbon build up on the tailpipe, but no sign of gasoline mixing in the oil.

Any suggestions??? :unsure:

Thanks.

***NEVERMIND!** I changed the spark plug wires and Betsy runs like a top again!!!! :D
 

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