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Q:

engine ping-knock @ idle on 1991 Mercury Tracer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My car has a pre-ignition ping-knock @ initial start-up and also @ a low idle in gear and also w/air-conditioner on @ idle.
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