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Q: Can I ,a very handy person, change the idle air bypass valve?
If so, some detail on 2004 Mercury Grand Marquis

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The check engine light revealed it has to be replaced
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Yes, it is really just 2 -> 8mm bolts and a gasket. Disconnect your battery negative terminal for 5 minutes to let the memory erase, then when you start your car, let it idle for awhile. It will idle faster than normal, then it will gently come down to a normal speed. Then drive your car, it will take a few miles for the computer to adapt to the new idle valve.
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