Zj idle issue
So for about a week or so my 4.0 has had a serious idle problem. It's just rough seems like a misfire and does it while driving sometime. Here's is what I've done so far:
Pcv breather filter and elbow
Checked vacuum lines
Clean tb, iac,tps,and pcm
New fuel filter and added injector cleaner
Now I'm leaning towards fuel pump...any thoughts?
With it worse at idle and only intermittent at speed, I'd be leaning towards CPS.
Anyway to test it without swapping in a new one?
Thanks for the help ill pick one up later today and post my results...wish me luck lol
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