Possible crankshaft position sensor failure. Heat sensitive; goes out of spec when engine gets to operating temp. You can do a search on this forum for more info on testing and location of sensor. Also, as noted above, inspect the rotor, distributor cap, wires and plugs. This engine will go through these parts faster than domestic engines and runs poorly or not at all if they are shot. Buy OEM or equiv, no URO parts.

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