Originally Posted by greygoat
Engine light keeps going off and on. Auto Zone ran test and said manifold problem. Before I could get it to dealer light went off, and they didn't want to look at it then. Light goes on for couple of days and then goes off for couple of days. Any ideas what the problem might be. Gas cap is tightly on and in good shape.
I'm sorry to hear about your Check Engine Light. In addition to a loose gas cap, the CEL can come on for a variety or reasons, even poor fuel quality. If the light stays on through several of your typical drive cycles, a diagnosis would be recommended. In most situations, the vehicle will drive normally and won't require towing.
If the light begins to flash, service should take place as soon as possible. Your Jeep dealer would be able to diagnose and review a CEL condition to provide further details.