I didn't drive it with the egr unhooked. I only let it idle and used the throttle to rev the engine. Why would regular plugs be better for this car than the others? Just wondering. It's hard to describe the hesitation. Almost always it kind of jerks a couple times and then feels like it has no power until it revs back up. Sometimes when coming to a stop it does the same, but without the jerking. The closest thing I could describe it to is like trying to start a standard from a stop in third gear.