Rough Idle, Fuel filter?
 

Here's what I have. A 96' ranger 4.0. I replaced plugs and wires about 5000 - 7000 miles ago and I have a new fuel filter that I am planning on taking care of this week or so. I do have a check engine light on for the egr system and I was told that the tube that runs from the bottom of the egr valve should be taken off and cleaned out and the egr sensor also with carb cleaner. Could a check engine light cause my truck to run differently and can a fuel filter have that kind of an impact on idle?? Any help would be greatly appreciated. Thank you for your help!

RE: Rough Idle, Fuel filter?
 

change the fuel filter, but also check the gap on your plugs (and the brand!!). I put Bosch plugs in my '99 yesterday and now today I'm taking them out in favor of Autolites. At least that's a cheap and easy test.