Engine misfires throughout the driving speed range
* Blocked carburettor jet(s) or internal passages
* Fuel injection system faulty
* Carburettor worn or incorrectly adjusted
* Fuel filter choked
* Fuel pump faulty or delivery pressure low
* Fuel tank vent blocked or fuel pipes restricted
* Vacuum leak at the carburettor, inlet manifold or associated hoses - carburettor models
* Vacuum leak at the throttle housing, surge tank, inlet manifold or associated hoses - fuel injected models
* Worn, faulty or incorrectly gapped spark plugs
* Faulty spark plug HT leads
* Dirty or incorrectly gapped contact breaker points - pre 1982 models
* Faulty condenser - pre 1982 models
* Uneven or low cylinder compressions

Engine hesitates on acceleration
* Worn, faulty or incorrectly gapped spark plugs
* Carburettor accelerator pump faulty
* Blocked carburettor jet(s) or internal passages
* Fuel injection system fault
* Vacuum leak at the carburettor, inlet manifold or associated hoses - carburettor models
* Vacuum leak at the throttle housing, surge tank, inlet manifold or associated hoses - fuel injected models
* Carburettor worn or incorrectly adjusted

Engine stalls
* Incorrectly adjusted idle speed and/or mixture settings
* Blocked carburettor jet(s) or internal passages
* Fuel injection system fault
* Vacuum leak at the carburettor, inlet manifold or associated hoses - carburettor models
* Vacuum leak at the throttle housing, surge tank, inlet manifold or associated hoses - fuel injected models
* Fuel filter choked
* Fuel pump faulty or delivery pressure low
* Fuel tank vent blocked or fuel pipes restricted
* Throttle positioner/idle-up system (where fitted) incorrectly adjusted