Question Asked: My engine idles rough after driving at higher speeds. (50+ mph).
February 15, 2012, 09:42 PM
The needle on my RPM gauge bounces up and down and my engine "studders" as my car is decelerating from higher speeds. I pull over and turn off the engine for a just few minutes, and it starts up nicely and runs smoothly, no problems at all (as long as I don't go over 60 mph). It sounds crazy, but I swear that on rainy days or when humidity is higher I can only get to 50 mph before it acts up. No check engine light ever comes on when this problem arises. I've had 4 oxygen sensors and spark plugs replaced so far. I have 105,000 miles.