I have an 02 F250 5.4. First problem I notice is the coolant temp gauge in the cluster sticks occasionally. I shut off my truck and restart it and it goes away. Later on down the road you drive for a while over multiple starts, gauge works, but once you start the truck and the gauges pegs it wont reset with a restart of the ignition. Still drives okay. Then the check engine light comes on later. I put a code reader on it and it reads P1299, "Cylinder head over limit protection", shuts off four cylinders. I erase the code. Truck runs better. Next day I start the truck, gauge reads fine, I drive it a ways, throws the code again and shuts of four cylinders, truck runs bad again. I assumed it was the the thermostat but the main coolant hose that runs to the head heats up with the motor. So I suspect a water pump. No water leakage in the weep hole or on the ground, no bearing noise everything spins smoothly. So maybe a scarred piston or warped cylinder wall? There's no knock engine idles quietly and smoothly. The only thing I noticed was at first start up and only the first, the truck spits and sputters a bit but I figured that was due to the four cylinders being shut off from the P1299. I know there are two sensors, one for the coolant and one for the head that throws the code. Could one of these be faulty? The only other thing is the truck hesitates just a tad when driving even without the code but I swapped a failed coil pack in the past to fix that one other time but its not reading a misfire so I dont know. Please help!