My GMC truck runs a little rough when cold, but better when it's warmed up. It will seem to jump a little after it warms up at highway speeds. I replaced the gas filter, spark plugs and wires, but it still does it. It's a 454 engine. What else needs to be replaced for a tune up? What would make it "jerk" while driving? Thanks
have the same problem?
Saturday, January 12th, 2008 AT 6:35 AM