I am having an issue with Misfire on #1 replaced coil, plug and pack. Pulled the plug and found moisture in the cylinder. Ford told me might be blown head gasket. Put block seal in the engine and it cured the problem for a couple months. So I am having overheating issues. From time to time the water temp gauge will peg out on Hot.And so took it in to a firestone shop and had them replace radiator, themostat and upper and lower connecting hoses. Came back with misfire on # 7 & 8 so had those plugs replaced with motorcraft plugs. Drove it for 5 min this morning and it pegged hot once again. So took it back to the shop and it came back with a code of 1299 engine temp overcondition. When all plugs are pulled there is not water or coolant found in the chambers. Also had misfire on one. Had plugs in 1 & 2 replaced yesterday. Any ideas of where to start looking as to the cause to my problem and possible fix?

The truck is a 03 F-150 4.6 motor with 245,400 miles on it

 

Came out 12 hours after parking the truck and i find a large puddle of antifreeze under the truck

 

water pump maybe

 

was thinking the same thing hoping its something cheap and hopefully not a blown head gasket or cracked block.

 

Qik Slvr. I have same truck( year and motor) and same problems (190,000 miles). I did all of the fixes u did plus a new water pump and temp sensor. When the temp spikes I pull over turn off the truck for about a minute or so and it's ok until I turn it off and try to drive again. I hate to say that it's looking like a head gasket or cracked head or block in my case. I've been looking into finding a good ford engine builder in Maryland or a crate motor. Everything is new in my engine bay except the block n heads.

 

It is most likely a blown head gasket as it was in my case and set me back about 1800 bux

 

Did you ever find that Ford engine builder in MD?