87' 300D Another no start or sometimes start problem

[EXIT39]

Some times it starts right up and then try again and nothing. All I might hear is a click when I turn the key off.

Some history: I have been pouring tons of time into this girl

New glow plugs
Rebuilt injectors
IP seals replaced at same time
Recent new battery
Replaced ground strap on motor
Harness wire replaced as it shorted out and I almost had a barbaque
New harness housing
New 50 AMP GP fuse
Removed and cleaned fuel tank and new strainer
All new filters
Resealed Vacuum pump
New radiator
New alternator brushes
New copper fuses

I purchase lots of stuff from Kent Bergsma (Moly, rebuild kits, hoses, connectors, tools. etc.) I know a little pricey at times but usually worth it in what you get the added knowledge you receive with the parts.

I purchased a new ignition switch. and electrical switch connector for it. But cannot seem to see how it could be even remotely possible to replace them. At this point I am totally stumped.

So I follow the ideas regarding NSS posted here and elsewhere and go thru the gears then put it park and pow she starts right up. No glow plugs waiting or anything. Pretty sure it is my NSS in this case but am going to try in the morning same thing and see if I can start it without playing with the shifter. Guess we'll have to see about this.

Started the car early in the day and let it sit idling for awhile. All of a sudden it ran away on me. Total red line. Flew out of the house and shut it off. Then no start at all after that for the rest of the afternoon. Go out at 5:30 and got it going again with my OLD key, geez. WTF. Now I am not sure what is causing my no start problem. Do I replace the lock tumbler and the NSS? Could really use a bump here people. And what about the Alternator/Starter harness?

[SD Blue]

I'm getting conflict here, due to your list. Are you defining "no-start" as the starter isn't engaging and turning the engine over? or cranks over fine but won't fire?

The reason I ask is they are two different issues. I'm assuming it is the first problem we are dealing with. Sometimes the problem with the NSS isn't the switch itself but worn shifter bushings instead.