The egr has nothing to do with idling high, the egr valve is not used at all at no load. and if there was something wrong with the egr valve it would cause the idle to be very low. check your EGR valve for leaks on your exhaust manifol. If you have a factory service manual, they have trouble shooting on almost everything about your car. Check your Air filter or Fuel filter. I replace my air filter once a year, Maybe replace your Fuel filter after 30,000 miles. A high idle is typical of a vacuum leak, I don't know where the above answer has any relation to this. if you have a carb, it may not be adjusted correctly.. from: jay c.-- In my own humble opinion, irratic idle is typical of a vacum leak. I had the same problem with my 8 year old sedan, Had the idle air control valve checked, Air Flow Valve, and throttle serviced... all did not solve the fluctuating idle. My mechanic suggested to replace the gaskets (rubber seal) of the valve cover and the manifold, my car's idling perfectly, it's smoother and sounds much better. My mechanic told me that the previous repair used an inferior gaskets and compensated it by using silicon sealants... the silicon sealants eventually wore-off leaving gaps, causing leaks.
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