Why my car do not start? on 1991 Buick LeSabre

I've tested the starter and the alternator out at the mechanic shop, but they said that it's working fine. I also changed the battery and still my car don't start.

by in Oakland, CA on March 22, 2010
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2 answers
ANSWER by , September 02, 2010
bad coil packs or modulator under coil pack
ANSWER by , March 22, 2010
Check the ignition switch as this car is old enough to have worn it out