My car all of a sudden idles high, (4,000 RPMS in park) on 2000 Ford Focus

It wants to take off like a bat out of hell when in gear, if i put it in neutral it just revs till its redlining?

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2 answers
check for a vacuum leak and scan test for codes
A vacuum leak will not cause it to "redline". You need to have the PCM scanned imediately.