because i have an internal egr on a 2002 and i have no cat, could this be the reason my truck runs weird after its warmed up. after ive been on the free way awhile and then i go into town my truck starts to run weird after i sit at idle for awhile. It dosent idle eratic but if i give it gas sometimes it doent really respond and it sputters. I was thinking the fuel pump but i doubt it cuz ive always ran injector cleaner and it never as been stressed. Maybe im getting bad air when i idle? How could this be?