Fuel Injection Problems of Kia Motor Rondo

The following applies to my 2007 kia Rondo with approx 36,000 miles on it. It has the v6 engine. My problem is a severe safety hazard in that the engine idle does not come down as the car stops and in some cases it races up. Unfortunately it is very sporadic and it has been to the dealer three times with them unable to duplicate it. This morning 4/18/2010 I came to a stop and the tach said 1500 and was actually going up. I took it out of drive and it immediately went up to 4000+ rpm (I was not even near the accelerator). It only seems to do this on cooler mornings when it is almost, but not totally, warmed up (4-8 miles) but once again very sporadic. It will go weeks without happening. The dealer suggested possible carbon buildup on the throttle body so I ran two bottles of fuel injection cleaner though it. Did not do it while this was done then happened again. The really bad part is there are no codes being given. My suspicion is throttle position sensor or speed sensor but the dealer said they checked them and they were within spec. This leaves basic program faults. I have documented my 3 trips to the dealer in case of later potential accidents and litigation. I don't know if others have experienced this but in traffic or being driven by someone without quick reflexes, it could cause a serious accident. It seems the only answer the dealer has is to leave the vehicle with them for as long as it takes to duplicate the problem (already left it there overnight once with no help). Or pay for a special cleaning of the throttle body both of which are unacceptable. This is obviously a warranty item and they should fix it for free or if it has to be left with them for weeks then there should be a free loaner. I have also contacted kia customer service and so far they have been less than helpful with the first recommendation to call them from the dealership. When I did no one who could make a decision was there and they have not called back.

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