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Q: pre ignition on 1999 Ford Escort

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my car knocks, even with premium gas. i have checked all vacuum hoses and cleaned the throttle body and EGR. What else can I do?
(1) Answer
Probably the mass airflow sensor is bad, Napa has rebuilt units available $108 to $139 plus a core charge, about 1/2 hour to replace
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