I have the same problem. I own a 1997 Kia Sephia GS 1.8L Manual Trans. 4Cyl. 130k approx. Miles. I did some maintnace of the following: Spark plugs, Spark Wires, Rotor, Spark Cap, Cover Gasket (was leaking), PCV valve. After that update, my car runs good and Idels fine. Once and a while when Im driving it, the power will cut and the RPM's will drop, unless I accelerate. When I do continue to accelorate it will continue to climb in RPMs and speed not cutting out untill I try to hold a certin constant speed. The other fix is to stop and shut off the vehical. Then restart and continue to drive. It may or may not do it again for the rest of the trip.
I think it might be a Throttle position sensor or Timing Belt issue.
I have to replace the Water Pump anyways, so I am doing the Timing belt at the same time. I will see if this fixes the problem.
Yet it could be Crank Angle Sensor or Mass Air Flow Sensor. All are expensive to replace. : (
Friday, November 21st, 2008 AT 1:02 PM