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In my opinon, your coil pack is probably not the problem. If your car runs then the coil is functioning, that is the spark plugs are firing. If the spark is not hot enough to burn all the fuel, I'd try new plug wires or hotter plugs. Could be an injector problem. check the resistance accros the terminals of the coil pack with a digital ohm meter. You'll need a manual on the car or a nice guy at the dealer for the specifications.

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Q: If a 1994 Chevy Beretta z26 is not passing amissions how do you check if its the coil pack?
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