97 D1 4.0, 180K for miles, Heres the problem. Cranks up and runs great, after it warms up to normal operating temp it starts to stumble, and misfire and looses power and while trying to keep it going it will back fire through intake. Once it cools off it runs like a champ. Heres what i have done, I had a spare coil assembly, put that on, no change. I replaced the CKPS and dressed the wires leading to the sensor, they were melted i took care of that all the way up to the intake manifold. I have 34 pounds of fuel pressure, even when its stumbling, fuel pressure holds solid. threw a filter at it, cuz i had one. no change. I even tried to spray the new CKPS with cool water to see if it would make a difference and it did not. so i am at a stand still, need some direction as to what to check next.