Eric...My '03 GMC DMAX with 6500 miles has started to surge / lope when it idles. Its most noticable when cold. When cold, the idle speed seems to vary around 100 rpm. Its also starting much harder cold and slightly harder when warm. I suspected either fuel or filter, but neither a new filter or new fuel changed anything. I'm getting ready to take it in, but thought I'd see if you had any thoughts first.
Thanks!
Scott
On Edit: I just replaced my fuel filter before this started. During the bleeding process, I pumped only until I saw fuel in the threaded hole for the bleeder screw. Could I have not bled the system enough, and still have trapped air?Edited by: Roegs
Thanks!
Scott
On Edit: I just replaced my fuel filter before this started. During the bleeding process, I pumped only until I saw fuel in the threaded hole for the bleeder screw. Could I have not bled the system enough, and still have trapped air?Edited by: Roegs