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I think the crank position sensor is probably the culprit here, it could be as simple as its a little loose and not always close enough to the reluctor ring on the flywheel to tell it when to fire..another place to look is the sensor in the distributor, I think it acts as the cam position sensor if i remember correctly.Also check the wires going to the upstream O2 sensor, its easy to route those wires incorrectly and they'll hang on the exhaust manifold and eventually short out causing a no start.. when i replaced the motor i routed the wires incorrectly and it was nightmare to figure out.. taped the wires back up, zip tie them out of the way and never had another issue
I think the crank position sensor is probably the culprit here, it could be as simple as its a little loose and not always close enough to the reluctor ring on the flywheel to tell it when to fire..
another place to look is the sensor in the distributor, I think it acts as the cam position sensor if i remember correctly.
Also check the wires going to the upstream O2 sensor, its easy to route those wires incorrectly and they'll hang on the exhaust manifold and eventually short out causing a no start.. when i replaced the motor i routed the wires incorrectly and it was nightmare to figure out.. taped the wires back up, zip tie them out of the way and never had another issue