x-90 P0335 code

[fixkick]

I have included a youtube video of the wave forms so you can see them visually and not a still or them.

https://youtu.be/-QzbIV7t-oI

real nice video.
all that is good,  you have 4v Peak to peak. CKP signals, that plenty
so must be going low driving, 1 in 20 pulse drop out , will set 335 error.
i call bad wiring, 
i  would run new cable, 2conductor shielded.
for CKP, for sure cheaper than spare ECU, would be.

i can see that scope has ground 0v in center of screen and you get 2 volts above zero then -2v below, and the ECU has zero crossing detector for CKP input.
so that is a good signal for idle .

if CMP drops out driving the car bucks hard or dies for length of loss of CMP.  all spark ends at the lost of CMP, no matter how fast the loss. (will be felt as misfire or bucking)

my guess when car is moving the CKP drops out due to wire failing.  (one thing to know is that the signal my pass through (IDK) huge injector plug-in in the harness just below
the intake manifold,  if yes, then reseat it.

this connector is well hidden above Alternator and below intake manifold.

if CMP is good, then the engine will run fine.  just like 1992 to 1995 did with NO CKP there those years.
what will fail is , no misfire detection. mostly.

nice work you did !!!!!!!!