I have a 1998 Kia Sportage and it idles fine with check engine light on but when you go to drive it the motor runs rough and the check engine light blinks Any ideas?
There is oil in the fourth cylinder spark plug hole. You need to replace the spark plugs, wires and the valve cover gasket. My 1998 had the same problem. The Wires are expensive because you have to buy the coil pack with it. But this will solve your issue.