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pinging on super unleaded 200 85

Hey, My '85 245GL pings even though I use 93 octane.

It mostly does it during hot, sticky weather.I did all the usual stuff, cleaned throttle body, checked for vacuum leaks, cleaned flame trap, fresh plugs, wires ,rotor, and cap,AMM is fine, O2 sensor is good.Why does is ping with no load?

Thanks, Phil






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