CHECK THESE LAST:

20. CARBURETOR ICING; CONFIRMED IF ENGINE RUNS ROUGH ON RESTART
Ensure air intake preheat stove, valve and duct are functioning properly.

21. FAULTY CARBURETOR ACCELERATOR PUMP
Have carburetor accelerator pump professionally replaced.

22. EXHAUST MANIFOLD HEAT CONTROL VALVE (HEAT RISER) STUCK CLOSED
Have heat riser professionally serviced.

23. MALADJUSTED OR ENGAGED PARKING BRAKE
Release parking brake or adjust it.

24. WORN OR JUMPED TIMING CHAIN OR TIMING BELT
Have timing chain or timing belt professionally replaced.

25. FAULTY THROTTLE VALVE OR THROTTLE POSITION SENSOR ON FUEL INJECTION
Have throttle valve or throttle position sensor professionally serviced.

26. FAULTY IGNITION COIL
Have ignition coil professionally replaced.

27. INCORRECT DWELL ANGLE OR POINT GAP
Have dwell angle or point gap professionally adjusted.

28. POOR QUALITY OR CONTAMINATED FUEL
Use higher quality fuel.