Jeremy- Unfortunately I have way too much experiences with KIAs and had a recurring issue with my 2004 Optima which after several diagnosis', hundreds of dollars and countless man hours spent turning wrenches under the hood we finally determined that there was short in one of the coil packs that was grounding out to the motor. Aftermarkets are available at Autozone for about $125.00. Unfortunately, and because of the nature of most used car dealers in WV, most sell vehicles AS-IS with a tail light to tail light warranty, which simply means that once the vehicle gets far enough down the road that the two tail lights start to look like one the warranty is void.
"BRIAN, Close the window! You're letting all the Stank out...." "Ahh, ahh, ahh and boom goes the dynamite."
DON'T MESS WITH TEXAS(It's not nice to pick on retards.)