7.3 code po603 internal ctrl mod KAM ERROR
 

WHAT DOES THIS MEAN AND HOW TO FIX RUNS ROUGH AND MISSES:-banghead:-X09

https://www.ford-trucks.com/forums/1...ont-start.html Have a read through this link for ideas. In particular if you have a chip or maybe try cleaning the connector to the PCM.
For more info maybe try posting the problem on the page for your engine.
Good luck.

thanks link very helpful

found problem chip was dusty and alittle loose fixed all problems thanks again

Good man. Glad you got it fixed.