1999 Ford Escort Q&A

1999 Ford Escort Question: pre ignition

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? -
Answer 1
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 -