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Vacuum leak Repair vacuum leak Improper float bowl fuel Reset float level adjustment, see FUEL Clogged air bleed or idle Clean carburetor passages passages, see FUEL Clogged or worn air cleaner Replace air filter filter Faulty choke vacuum Replace diaphragm, diaphragm see ENGINE PERFORMANCE Exhaust manifold heat valve Replace heat valve inoperative Improper distributor spark Check distributor advance operation Leaking valves or valve Check and repair components valvetrain Improper carburetor Remove and remount mounting carburetor Excessive play in Replace distributor distributor shaft Loose or corroded wiring Repair or replace as connections required Engine Surges Improper PCV valve airflow Replace PCV valve Vacuum leaks Repair vacuum leaks Clogged air bleeds Remove restriction EGR valve malfunction Replace EGR valve Restricted air cleaner Replace air filter filter Cracked or broken vacuum Replace vacuum hoses hoses Cracked or broken ignition Replace ignition wires wires Vacuum advance malfunction Check unit and replace as necessary Defective or fouled spark Replace spark plugs plugs Ping or Spark Incorrect ignition timing Reset ignition timing Knock see ENGINE PERFORMANCE Distributor centrifugal or Check operation and vacuum advance malfunction replace as necessary Carburetor setting too lean Readjust mixture |