UPDATE! Went back and rechecked all vaccuum lines from throttle body to TWSV to EGR Modulator to EGR. All clear. Checked intake and exhaust to EGR...all clear. Verified EGR Modulator good per the Haynes Manual. Verified EGR diapham good with vaccuum pump. Only thing I have not done is apply 12v to TWSV to verify it shifts. I cleared the trouble code and started up. It still runs intermittently rough at idle. Cant tell if it is fuel or spark. Its almost like the ECU cant make up its mind on Fuel or Ignition timing. Someone please HELP!!!
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