I am not a certified mech! I do have a couple questions for you. Is the check engine light on? Yes and you already said that at higher speeds its better, right. Does the motor make alot of noise, now that this is happening, Probably and if not get ready for it. My opinion and thats what it is. Its probably the timing chain and that is causing a problem with one of the valves probably in #5 which could causes the rough idle, but not at the higher speeds. I would do a compression check on the engine. Do not go and spend alot of money replacing o2 sensors, you probably have 4 and thats the first thing they say to do. It might be that time to get rid of it but I know how it is, Im in the same boat right now, wondering whether to fix or sell. Good luck and hope I helped out and let me know what happens. Oh by the way you can check your own codes or clear them by yourself its fairly easy. Check your owners manual. The more input you give the easier it is to diagnos.
Friday, January 8th, 2010 AT 7:21 PM