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Fuel system
Engine idle speed set too low.
Idle fuel mixture needle(s) not properly adjusted.
Float setting incorrect.
Air leaks between the carburet-tor spacer and the manifold and/or fittings.
Intake manifold gasket leak.
Fuel leakage at the carburettor fuel bowl.
Power valve leaking fuel. Idle fuel system air bleeds or fuel passages restricted.
Fuel bleeding from the accelera-ting pump discharge nozzles.
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Leaking fuel pump, lines or fittings.
Ignition system
Improperly adjusted or defective breaker points.
Fouled or improperly adjusted spark plugs.
Incorrect Ignition timing. Spark plug misfiring.
Engine
Loose engine mounting bolts or worn insulator.
Cylinder head bolts not properly torqued.
Valve clearance set too tight.
Crankcase ventilation regulator valve defective or a restricted tube.
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POOR ACCELERATION
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Ignition system
Incorrect ignition timing.
Fouled or improperly adjusted spark plugs.
Improperly adjusted or defective breaker points.
Distributor not advancing properly.
Fuel system
Inoperative accelerating pump in-let ball check.
Inoperative accelerating pump dis-charge ball check.
Accelerating pump diaphragm de-fective.
Float setting incorrect. Throttle linkage not properly ad-justed.
Accelerating pump stroke not
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properly adjusted.
Leaky power valve, gaskets, or accelerating pump diaphragm.
Dirt or corrosion in accelerating system.
Distributor vacuum passages in the carburettor blocked.
Restricted fuel filter.
Defective fuel pump.
Brakes
Improper adjustment.
Transmission
Clutch slippage (manual-shift transmissions).
Improper band adjustment (auto-matic transmissions).
Converter One-Way Clutch (automatic transmissions).
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ENGINE DOES NOT
DEVELOP FULL PQWER
OR HAS POOR HIGH
SPEED PERFORMANCE
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Fuel system
Restricted air cleaner.
Restricted fuel filter.
Clogged or undersize main jets and/or low float setting.
Power valve or passages clogged or damaged.
Fuel pump pressure incorrect.
Distributor vacuum passage in the carburettor blocked.
.
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Ignition system
Ignition timing not properly adjusted.
Defective coil, condenser, or rotor.
Distributor not advancing properly.
Excessive play in the distributor shaft.
Distributor cam worn.
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