I just noticed this happening last night while cruising around with some friends. I was in 2nd gear going about 20 and I noticed the car had a slight miss or stumble. My guess is either my plugs need to be regapped, or maybe I am running rich after my pulley and chip? I won't be able to get her on a dyno until the 12th of July. The chip was supposed to be a "very safe" tune because of the 91 octane. Any ideas? Mods in sig.