1999 Jeep Wrangler Engine missing

In the morning the jeep cranks and idels fine. Between 150-190 degrees it starts missing. It looses power and acts it will quit running. Once up to engine temp, about another 1/4 mile down the road, it runs great. It never misses from then on.

When you shut the engine down and leave it for around 10 min and restart it it will starts missing again.
This will last for about 2-3 min and then it runs great. It will repeat this every time you shut it off and restart.

I have changed the plugs, wires, muffler, tailpipe and air filter. I took it to the jeep dealer and he ran the 23 point check with no problems. They couldn't or wouldn't take the time to evaluate the problem.

I pulled the plugs this morning. No 5 cylinder plug is different than the others. It actually looks like it is not getting gas. But the engine runs fine and seems to have adaquate power.

I recently purchased the jeep so I have no history with it.

Thanks for the help.

Ron