bad idle/misfires
Thread Starter
Newbie
Joined: Feb 2024
Posts: 2
Likes: 0
Year: 2000
Model: Cherokee (XJ)
Engine: inline6 4.0
bad idle/misfires
I got a rough idle and codes P0300, P0301, P0302, P0455, and P1491. I'm trying to figure out what I need to do to fix it. my head casting # is 0331 but never had any problems. already done a combustion test and cylinder 2 had 59psi. already replaced spark plugs and coil pack. any advice is appreciated 🙏
Junior Member
Joined: Sep 2016
Posts: 44
Likes: 1
From: Texas
Year: 1992
Model: Cherokee
Engine: 4.0
Have you checked for vacuum leaks? My 1992 Jeep Cherokee had a rough idle than it got to the point where my jeep began to stall when driving. It was my intake manifold gasket. Maybe check for vacuum leaks. Just a thought.
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