What would cause a car to idle heavily?

In: Parts and Repairs

check your EGR valve for leaks on your exhaust manifold

Answer

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..

First answer by James. Last edit by Lbeckman. Contributor trust: 81 [recommend contributor]. Question popularity: 191 [recommend question]

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Reasons cars may idle heavily?