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if the car has high miles like 150 the timing chain might be rattelling around at off load speed --- but what could also be a worn out distrbutor advance weight mech they will rattel at off speed and also cause the timming to be off from the loosness causing it to ping as well and higher oct fuel will mask the problem and i think you said you went away from the high test gas ?? a lifter wont go away with gas and carb cleaner forget that jz
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