Hey GREEN92LX, I had the same problem in my 88(speed density)mustang, I replaced my TPS,IAC(when I disconnectd it it idled a little low but otherwise okay),all vacuum lines(I found some leaks but fixing them didn't help),MAPS sensor,cleaned my EGR and TB and I am sure I have forgotten some things, and my car would still idle at 2000 rpm, then I cleaned up the 10 pin connectors on the back of the intake(by the TB) and my problem was solved. If its not that connection try cleaning some other connections and the ground straps(I don't even know where they are though).
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88 mustang lx ragtop pulley's and a k+n
14.8 at 93mph
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