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On 11/2/2015 at 3:43 PM, 87MJTIM said:

What year is the MJ?  I ask because Renix (87 - 90) and HO (91 - 92) have different engine systems.  This will help other diaguess (diagnose and guess) the problems.

 

I have the Renix(1990) I've been having "misfiring" issues and a hard vibration under power. At first start it idles smooth-ish and then gets rougher. Fuel pressure is within limits, compression is within limits in all cylinders. I'm out of ideas. Any advice would be greatly appreciated

 

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5 minutes ago, cruiser54 said:

Ever replaced the cap, rotor, wires and spark plugs?

Are all the vacuum lines on the engine intact?

Ever checked to make sure the intake manifold bolts are tight?

 

 I agree with cap and rotor checking.
your first post sounds like a worn out distributor bushing.

pull your cap off distributor grab the rotor and wiggle it. if there is any play this could most definitely be the culprit.

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