I know this sounds out there, but it could be a bad oil pressure switch. If it's going intermittent and not staying open or closed(depends on your model engine) it could be putting itself into limp mode. If it has an oil pressure switch it will be down above the oil filter on the side of the motor. The oil pressure sender is up on top usually around the distributor. If it does have the switch you can try unplugging the wire to it and see if it clears up and runs. If it doesn't you may have to ground the wire and run it and see if it clears up. But either way if it clears up and runs without the wire or with it grounded, your problem lies in the oil pressure switch. Also if it has two wires touch them together and se if it clears up.
Last edited by TTyler89; 07-28-2017 at 8:20 PM.
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