Apu rough idle/blowing soot

I just replaced the solenoid now and still does it. To clarify the solenoid was sticking after all.

 

Well, turns out I may have a bad high pressure switch for my AC, which was just replaced in May, I turned in on in fan mode and it ran fine, switched back to AC then ran fine. -_- this is dumb.

 

Okay well it was and wasn't high pressure that was causing the apu to shut down. They adjusted the timing for the compressor clutch from 8 seconds to 60 seconds. Which allows the motor to build up to the compressor kicking on. The pressure in the compressor was to much for the motor to turn that soon after starting. It wasn't a bad high pressure cut off switch at all. And to make things weird, the tech said my fan switch was fried, and that he was told by the foreman that they are not to replace said switch because it will still run to hot and will kill the motor. Is it just me or does that sound weird?

 

I mean the rad fan. Also exhaust pipe is clear it wasn't running fast enough to burn all the fuel out which is the cause for the black soot. Remember I said it starts up normally and would then bog down and begin shooting out soot and then eventually die. I left it running last night so here's hoping it's still going.