304 still missing

Hey guys, I searched around and haven't found anything like this.
The #3 cylinder of my 304 is missing at idle, but seems to go away at higher rpm's. Compression is good, I changed out the ignition module, plugs, wires, cap, rotor, and distributor after problem started, but makes no difference. No signs of water in oil to indicate a blown head gasket, but the jeep bible suggests a blown gasket just between cylinders. I drive it to school daily, so repairs must be completed during a weekend. Any ideas or suggestions that I could explore would be greatly appreciated.
Jake

 

If you had a blown head gasket, that would lower the compression on two cylinders, if it leaks between the cylinders.

A burnt valve would give you a rough idle, though again I'd expect a loss of compression. So will a dirty EGR valve pintle, but that won't be restricted to a single cylinder.

 

what about a weak valve spring at rpm might be flowing thru better

 

I have a 360 in my waggy that had simular symtoms turned out to be a bad lifter. $.02

 

Thanks for the ideas guys, I'll keep plugging away at it and hopefully figure out what's wrong this weekend.
jake