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the problem existed before I rebuilt the engine . It had 227000 miles.I am thinking it may be the timing chain set .i put a new one on before I rebuilt the engine. It is an off brand, it does not have the yellow link on it. the tensioner gives up at certain points. I reinstalled it on the engine;thinking the oil pump was not putting out enough pressure. Does the tensioner on the small chain work off of oil pressure? I did not buy a new one yet. do you think this could be the problem? I am going to be out for a while tonight . I will get back with you as soon as I can. Thanks