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So when you unplug either the CPS or OS it will take ALOT of cranking to get it to start. When it does it will be in limp mode but should run nice and smooth. If it fails to start with the OS unplugged it tells you the either the CPS is bad or the wiring associated with it is bad. Same goes for...

Security light has nothing to do with PCM power. It has it's own module under the dash which also controls EVO. If it is staying on it will start and then die

It might be a different guy but I think he has a YT channel and has a burb he did these modifications on. Kinda a self proclaimed expert

IIRC it's a carter

https://www.ebay.com/itm/326216973159

I bought a hose and pump for an older one

One of the things no one seems to test for is long term holding ability. Spring clamps shine there. How many times have you had to tighten a screw type clamp?

db2 no more than 8. 5 is better

Yes new or different heads. No to being cut apart

I wonder if they would have the steel reenforced ring land?

Diesel engine shouldn't matter

That's a good way to mess up the evaporative system. Gets raw fuel into places it should only have vapor

Need a lot more info. Was it originally a gas engine truck? Is the 4l80 from the 95?

Without the water pump turning shouldn't matter what the rpm is. Fill it up and watch for bubbles

You sure it was exhaust and not steam?

Missing a resistor on OBD2 will not affect it at all. TD, Turbine Doc, ran his for a year with no resistor to proves Steaksauce wrong. OBD1 will look for the resistor every 50 starts IIRC, It will set a code

Run a temporary power wire to the LP to eliminate that aspect. If that cures it then you can zero in on it at a more convenient time.

Is your security light staying on?

P series should have a dog house and make the OPS easier to get to

Don't know on the p series but trucks LP get their power from the oil pressure sending unit. A good IP will suck past a dead LP