04 gmc safari 4.3 rough idle

[nmiller803]

I just purchased a 04 gmc safari 4.3L, 37000 miles. runs good but has a rough idle worse when cold. It was a GM certified vehicle ( IF that means much?) Im big on maintenance. It was not serviced very well from the dealer. The oil had not been changed in some time. I changed the oil, filter, fuel filter, pcv valve when I got it. I plan on changing the plugs and cleaning the EGR valve and possibly the throttle body. Would there be anything else that would cause the rough idle? Thanks

[GM-Tech]

Lots of things can cause a rough idle. There's nothing common on these. Do you want a wild guess?

[nmiller803]

Lots of things can cause a rough idle.  There's nothing common on these.  Do you want a wild guess?

 

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Well, I dont want a wild guess. It also gets pretty poor gas mileage (12PMG). Should I have to change plugs by now? Is cleaning the EGR and TB a good idea?

[GM-Tech]

It's pretty early for needing a plug change. Cleaning the TB wouldn't hurt, though I don't know if it'd help anything. I'd say attempting to clean the EGR would be a waste of time and effort.

 

I'd look in the distributor cap for corrosion, but that would cause more than a rough idle. Injectors may need cleaning, but again, not a common issue on these.