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I just bought a 81 bronco with a 351 and it has a small ping only on acceleration and it only happens some times.
I can start it up and the ping will be gone.....I could stomp on it and it will have no sound at all and the very next time I start it up it will ping again.........
I have tried to adjust the distributer a bit for about a week and no luck. Checked the air filter and plugged......could this have anything to do with it................