Ok.. the most common cause of this condition(s) you are having is either a bad camshaft position sensor or a bad crankshaft position sensor. The computer uses both of these sensors to determine thee engine speed and thus control the fuel and ignition timing. If one of these sensors go bad (even intermittently) it can cause this sort of problem you are having.

Also, check the distributor sync. If it is out of sync, (turned too much in either direction) it will cause this problem too.

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AMEDEE