2003 kia vibrates after warmed up
Try cleaning your idle air control valve. Here's a short how to video: http://www.youtube.com/watch?v=jgbTdyeaWbM
I replaced IAC, maf. even had a garage do test for leaks. changed plugs, wires etc. it's ok when cold but vibrates when warmed up
Try replacing the ambient air temp sensor. I know that it relays info to the computer which regulates idle.........
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