ect no signal 95 6.5
 

when disconect plug to ect on friends truck revs go up when put test light revs go down again. My truck disconect plug no change put tester on it stays the same it seems as their is no signal plus hard to start ie a real pig.Just bought truck paid $100 for been stood 5 years drained diesel out put fresh in new batterys it will start and drives new to this diesel stuff.

no signal could be a bad PCM