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I will try and add all the possible scenarios. Make sure all the wires are on the right plug and properly set in the plug. The right plug has been installed. The right gap for the plugs. When you removed the old plugs it is possible that some dirt fell into the plug hole and now is on the valve, preventing the valve to close properly. ( usually use an air compressor to blow out the plug hole before ). If it is dirt on the valve, it should burn away after a few miles. Make sure all the ign. wires are good.

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Q: Change spark plugs on 1993 crown Victoria now wont idle what do you think could be wrong?
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