Jeep Repair Problems? Ask a Mechanic for Answers ASAP
If you have problems like that and no check engine light on, I would be suspecting a bad PCM that is unable to diagnose itself and cause an over-richness of the system. You would have to be running VERY RICH for the manifold to get that hot. You stated that the exhaust is free, what test did you perform to conclude this?
Thanks in advance for your ACCEPT,