2005 4.0 Slight sputter .

[explorerey]

First time post long time lurker here. Hope you guys can help me with my dilemma. I have a 2005 4.0 X with 84,x.. miles that has recently developed a slight sputter in low rpms. Feels like a slight drop in rpms more like it . It usually happens in park or at a light, but it's constant. I have changed the plugs, air filter, added a can of sea foam, and cleaned the tb. Took it over to AutoZone and got a p2104 code prior to cleaning the tb. Not reading any codes after tb was cleaned, but sputter still there. Possible vacuum leak?

Thanks in advance.

 

[explorerey]

Bump.

 

[miker104]

I've heard that they are subject to Intake Manifold leaks and that can cause lean running that may or may not throw a code.

Here is some good reading on the system and P2104 code

http://articles.d-tips.com/art8.html

 

[swetrid]

Did the codes come back?

 

[explorerey]

No codes. Did notice it only does it between 700-1200 rpms when applying my foot on the gas. Once RPMS go over 1200 sputter is gone. Also, my MPG has gone down to 13-14 from 15-16 city driving. Sprayed brake cleaner around the intake, tb, and several vacuum lines in search of a leak, but none detected.

 

[explorerey]

Just finished installing a new pcv valve.... Pointless.