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I still loose power after changing plugs wire and coal(module) what's next?

(1999 Ford Explorer)
in Beverly Hills, CA on April 03, 2011
i still loose power after changing plugs wire and coal(module) what's next?
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Popular Answer
on April 03, 2011
Have you had any engine performance testing done?

If not, you're flying blind and making guesses.

My immediate initial thought -- you may have an exhaust restriction that could be keeping performance down.
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