Originally Posted by JeepJon15
One more thing i thought of that may or may not be connected. Sometimes when i turn the key to start the jeep it seems like theres a power surge where it turns very slowly then speeds up and fires up. As its struggling my lights typically dim a bit then get full power back between engine turns. The starter is only about a year old, maybe a little less. Battery i think is from 04, but can a battery cause shut off problems? It does seem to die rather quickly when trying to get her started on bad days.
That is the classic symptom of bad battery cables. Either replace them or at least replace the ends. If they look original or over 10 years old, just replace them.
Grounding the ignition module like 4x said made a big difference in how mine ran.
I put a new cap, rotor and plug wires on mine when I bought it so put off the Team Rush upgrade for a long time, but it made a big difference too when I finally did it.