Misfire Issue

[moparsz]

I've had a misfire issue code for a while and I can't seem to figure it out. it drives on the street fine and races fine. made 7 passes yesterday 8/2 with in .060 of each other, but at an idle it seems to have a misfire and pulls up a code for cylinder 8 (0308) and occasionally a cylinder 4 (0304). I've swapped coils, injectors, and plugs and it doesn't follow them so that rules out those. I've done a fuel pressure test and its about 50-51psi, and done a compression test on all cylinders and its 145-150 psi, and also just changed again all 4 o2 sensors. There has been times where the CEL goes out for a while but comes back. Does it sound like it could be the lash adjusters and its a overhead cam motor not a pushrod motor. I'm kinda lost on what it might be.

[bracketracing]

Intake leak or camshaft

[moparsz]

I have the valve cover off and the cam looks fine. No wear marks or anything

[bracketracing]

Don't have any experience on later model mopars. Our overhead valve motors the valves will hang in the heads. Try some top end engine cleaner. We know it's not carbon but may still be hanging in head

[548h]

If its a vacuum leak you should have high fuel trims at idle but ok while driving.

Could also be a poor injector flow issue. These seem to show up more at idle.