Dave:What do you mean by a small air filter missing ??I do not recall evert see a small air filter,my guess for your high idles is the wear on the bushing of your trottle body butterfly wich gets stuck unless you kick the trottle pedal. If you removed the intake accordeon and the horn of the trottle body you may be able to see if you have to much play on the butterfly especialy the passenger side.
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