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Confirm the timing.

Pull the #1 spark plug, bring the crank around to get to top dead center on compression,
see timing mark, pull the distributer cap and check that the rotor is pointed to the #1 lug on the cap.

If not, the cam timing has slipped at the timing chain or the dist. gear has stripped.

If none of the above, inspect the cap and rotor for carbon tracks or cracks.