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Start by resetting the computer, by disconnecting both battery cables and rubbing them together, if the problem returns check the following.
Verify engine vacuum is 19-21 inches and the manifold absolute pressure sensor voltage is 0.85-0.95 at a warm idle. If the MAP voltage is high, the manifold vacuum is low. If vacuum is low, verify the timing belt alignment and valve clearance is correct. If the timing is on and the valve clearance is correct, then there is an engine mechanical issue usually caused by overheating the vehicle.