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 Ive'  been chasing this high idle problem for a long time. Rebuilt engine 30,000 miles ago , changed all sensors and IAC. Did'nt  find any vac leaks. Checked all grounds. Pulled computer and checked connecters, no problems. Finally found the problem! Found corrosion at EEC relay at left...

 hi everyone,   I've been checking these forums for years. i've had my bronco  for about 12 years.  Rebuilt engine and AOD trans. Will post pics later.