What are the symptoms of a bad egr? or in my case one with the hose blocked off but the valve still there. It didn't throw a SES light. Can this cause a slight stumble without programming it out? I plan on getting it programmed soon but i'm curious how much this is affecting me now. My car stumbled like crap after my header install. now after ~80 miles its much much better but still has a slight stumble at some part throttle low to mid rpms. I did a really good job routing the sparkplug wires, but i can't rule that out completely. I'm not going worry about it too much till I get it programmed, I was just wondering how much of an effect people think this may have.

Thanks in advance.
-Brent

SLP headers, high flow cat, SLP 2OTL, !air, EGR Blocked.