Start with the basics. Pull a couple of spark plugs, and check the condition. If OK, then check ignition base timing. If it jumped, you may want to pull the front upper timing cover off, and check the valve timing. Do this by rotating the crankshaft to TDC, and see if the marks on the cam shaft line up with the timing marks on the case. You may have to rotate the crankshaft twice to get the marks pointed up. If the timing belt jumped a tooth, don't get cheap. Replace the belt.
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