pre ignition on 1999 Ford Escort

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?

by in Houston, TX on March 23, 2009
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1 answer
ANSWER by , March 26, 2009
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