Based on what you described.
You have a vacuum hose leak causing high iddle at Park. Checking out a leak Vac hose is doing one by one, but you need a Vacuum test like from Mity Vacuum. The common problem is the rubber hose connected to the hose got cracked due to aging.
http://www.amazon.com/Mityvac-MITMV8500-Silverline-Automotive-Vacuum/dp/B0002SQYUA/ref=sr_1_1/190-7721443-8311712?ie=UTF8&s=automotive&qid=1252476672&sr=8-1
1-Your cylinder #2 needs a new spark plug to replace a bad plug. This one you can do it.
2-After replace the new Spark plug, have it connected with the wire and touch the spark plug to the engine chasis, have a helper to start the engine, if you see a strong spark tehn you don't have to worry about your coil. The function of the coil is to produce the spark in the spark plug.
3-Finding a vacuum leak then your engine will be find. All problems that you have are really causing by the vacuum problem.
I suggested to find a shop to find the vacuum leak for you to speed up the fixing process.
Change the plugs. if still the same,change the coil for that cylinder.
Two of the cylinders of Mitsubishi galant 2001 will not fire. what is the cause?
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