long story short, while my girlfriend was driving. The check engine light started flashing and felt rough, like having a hard time going. When getting to a redlight, it shut off on her and hard time braking, I’m assuming the braking issue is due to it shutting off. She was able to turn it on again.

Now the ignition coil pack was replaced about a month or so ago and spark plugs replaced almost a year ago, about 10,000 miles into the Jeep maybe less.

I️ havnt scanned it but will do as soon as off of work today.

Any idea on what it could be?

 

Sounds like it's misfiring badly. See what codes it's throwing and post them up. Did one of the coil pack wires come loose?

 

Well that’s why i replaced the coil pack cuz it was showing misfiring. I replaced coil pack and reset. It ran perfect. The light came on now and flashing.

 

So i replaces the ignition coil pack and spark plugs. It runs a lot smoother Now. Check engine came on again. I scanned it using a friends scanner. Read 2 codes here they are.

P0442

and

P0740


Leak in evaporative system, how do i check that?
Mans i believe other is a mis-fire, what else could it be?

 

the p0740 is a torque converter code i think

 

Google the codes..............

 

Yes it is. And he is right about the evaporative system code. First place to start would be the gas cap. It may not be tight or have bad seals. The torque converter code could be secondary?

 

P0442 is an small leak in the evap system. Link to more info.

https://www.obd-codes.com/p0442
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P0740 is the torque converter clutch, no RPM drop at lockup. Link to more info.

https://repairpal.com/OBD-II-Code-P0740

Google the exact code + Jeep XJ (or Jeep Cherokee) to find specific forum threads of others that have had these codes. Good luck!

 

Neither of those codes will cause the engine light to flash. Let's hope you got the misfire issue fixed with the plugs and coil rail. If the flashing CEL comes back, scan again.

Also, get your own scanner or buy an OBDII bluetooth adapter and the Torque app. You're going to need a reliable way to pull and clear codes.