The engine starts and stalls several times when cold but will eventually start and idle at 1100 rpms for 30-40 seconds before the idle begins surging and falling from 1100-400 rpms and will eventually stall. Replacing the OVP with a used unit made the engine harder to start but when coaxed until warm would idle at a solid, smooth 750 rpm but still seemed to hesitate under intial acceleration.

The head gasket has been replaced, plugs and wires replaced. Your thoughts?

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