I had a n MSD ignition box on the jeep. The other day the box fried, so i took it off an returned the ignition to stock with coil and ignition module. The jeep now drops out at load coming from a dead stop. I changed the plugs, still does it. Now I regret to say I bought this jeep with some modifications already done ie. the MSD box. So I do not know if there has been any other modification to the engine ( new crankshaft, bored out, etc.) Could anyone give me some insight to what this might be. THIS IS MY DAILY DRIVER.

All help appreciated.

 

Forgot to mention. Jeep ran fine before MSD fried.

 

Test all sensors to begin with. Check for codes also