IF you checked the tb, and ok, sounds like broken hydraulic lifters. Prob never changed the oil, from previous owner. Pop off the cam and check the lifters. My 87 chevy s-10 did the same thing sounded crunchy, (because of the original owner never changed the oil) and 5 of 12 of the lifters were smashed. Just trying to help. Would help if you knew the history, and maintenace of the car. (whats been replaced or worked on)
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