do i check it with an ohm meter? which one goes to red and black? not sharp on these things?just need to fix this need to go out of town friday about a 3 hour trip one way and want to be safe. would this ovp also cause the ecomony setting to go in the red at idle. economy is good on the highway. as i said the motor sounds like a deisel at low speeds an idle. i appreciater everyone's help here.