Well that would depend on what kind of car it is. Engine timing is computer controlled with oil pressure. Low oil, dirty oil, sluggie oil will cause it. Oil and crankcase need to be cleaned. Seafoam is great at that. Regular oil changes with good oil help ALOT. If it's a turbo then full synthetic is needed cause other oil can't handle the heat. Depending on how bad it's sluged will dictate the repair. More info about year make and model would get you a better answer
Means the camshaft position sensor has moved or covered in muck and oil or come loose or it is broken.
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