Hello, my name is Richard and I have a 1996 Honda Accord LX with a V6. This car was fully loaded for its era and is estimated to have about 300,000 miles. Odometer stopped turning at 239,999.

A recent problem that occurs is that the engine idle will go very high when it is shifted to reverse gear. I have to press the brake pedal as hard as possible to get it to stop when backing out of the driveway. The car will return to a normal idle when I shift into drive and then it runs otherwise fine. I should mention that this problem first occurred a few months ago when my daughter slid into a tree when the roads were ice covered, but only going about 15 MPH through the neighborhood. Seems to be some type of vacuum-line related problem, but there are no obvious leaks. What air valve could possibly be triggered by the reverse gear?