That happen to me a few weeks back. I was all hyped up to go to the track when i go to my car to get it warmed up the key was locked, then on top of that my key broke in side. That angered me even more so i went ahead and turned the car on with a screw driver (i was still motivated going to the track) lol. Long story short when i took apart the ignition cylinder all the tumblers fell out, that was the issue. A new set of keys with the cylinder ran me down bout 16bucks at my local auto parts store. easy fix.
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