It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
There was no mention if there are any "symptoms" such as misfires, stumbling, etc. Are there any? Also, does the check engine light come on and off or does it stay on? The devil is in the details here.
I agree that the#1 thing is to definitely change out those spark plugs. The #3 fuel injector is suspect to heat soak as already mentioned. The other thing that is related to that specific cylinder would be the fuel injector itself.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!