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Originally Posted by thomasstudios
I read the MAF sensor and the wires and it checks good. I even replaced with a known good MAF. Same thing. Still misfire on #4 cylinder, idle does not go down to 700. In fact, it rises to 1200 once warm. Could this be a timing issue with the distributor, o2 sensor maybe? I'm stuck.
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did I say MAF ??????? air ducting I thought I mentioned must not be any leaks .....to throttle body.....
you also could have an intake manifold leak or bad PCV/hoses etc...anything bypassing the MAF causing the engine to get too much air ..