Kia Troubleshooting Questions? Ask a Mechanic
How well does it run off idle?
Ok, couple ideas for you to try. First, let me say we don't have this model in the 03. Check and see if it has a mass air flow sensor. If it does, try unplugging it and see if the car will then start and idle any better. The maf sensor is located between the air filter and the throttle body.
If it doesn't have one, then if it will stay running long enough, at idle, spray some carb cleared around the intake manifold and any vacuum lines you see. If the car starts to run better or the idle speeds up then you have a vacuum leak.
Please try these ideas and let me know.
Sorry for the delay in my response, I was out of town for a couple of days.
It sounds like a vacuum leak or a possible issue with the map sensor. If it doesn't have a maf sensor then it should have a map sensor. If this sensor is no good it will usually stall.
Also, check the purge control solenoid. Disconnect it and plug off the vacuum lines. If it's leaking it could be causing a fuel mixture issue and a vacuum leak.