I would start by looking for a vacuum leak. Remove the EGR and verify the gasket is correct, if they are cracked or flipped on some they will cause a leak. Check all the vacuum hoses as well. It does not take a very large leak to cause the engine to run faster. Being seventeen years old the lines are probably getting pretty rough and with the higher RPM a leak will be hard to hear so check them first with the engine off. Do not forget to check the brake booster line and the PCV line.
I have knocked more than a few off and suddenly discovered the engine wanting to "idle" at 2,000 rpm's!
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Friday, May 18th, 2018 AT 10:38 PM