CHECK THESE NEXT:

11. BLOWN CYLINDER HEAD GASKET
Have cylinder head gasket professionally replaced.

12. WEAK VALVE SPRINGS , LEAKING ENGINE VALVES, BURNED VALVES OR VALVE SEATS
Have valve springs, valves, or valve seats professionally replaced.
Have valve lash on mechanical lifters professionally increased.

13. RESTRICTED EXHAUST SYSTEM
Have exhaust system restriction professionally repaired.

14. VAPOR LOCK (WHEN ENGINE HOT)
Place cold, wet towels on mechanical fuel pump and fuel line to carburetor. Restart engine after vapor condenses back into liquid fuel.

15. WORN PISTON RINGS, CYLINDERS, OR CAMSHAFT
Use slightly heavier grade oil.
If compression and power do not improve, have components professionally serviced.

16. DAMAGED, CLOGGED OR KINKED FUEL RETURN OR SUPPLY LINES
Have fuel lines professionally repaired.

17. OVERHEATED OR CLOGGED CATALYTIC CONVERTER OR CORRODED MUFFLER
Have catalytic converter or muffler professionally replaced.

18. DEFECTIVE OR MALADJUSTED EMISSION CONTROL SENSOR
Have emission control sensor professionally serviced.

19. MALADJUSTED AUTOMATIC CHOKE
Have automatic choke professionally adjusted.