It all started the day after i got my oil changed at one of those shitty quick lubies. My car idles at less than 1000 rpm's, prob some where around 500 and sounds like it is going to clonk out at any moment. When i drive it, i can not get above 60 mph and acceleration is terrible. The check engine light is on as well. At times it just stays on solid and other times it flashes but never goes off completely. I thought that maybe it was a clogged catalytic converter so yesterday i put a new one on and that did not help at all. A coworker told me that it might be the egr valve but i cant find any thing on this for my car. I have a 2001 Hyundia Tiburon. It is a 4-Cyl. 2.0 Liter.