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I was referring to a temporary grd short of cps cable possibly disabling it. Your symptoms does lead some of us to question your relay connection socket on the relay 203.Do you think there may be a problem on that power board/socket that is intermittent.
We only mentioned the tone ring to rule it out.
I'm strongly leaning towards that junction box or possibly the ECU. Come to think of it, we can eliminate the tone ring, because it did run well for a bit, since the timing job. I'll be going over the harness tomorrow.
Began inspecting the harness this morning and testing the output if the new sensor. This was going to be quite the challenge, because I was missing my pinup cranking girl (wife 😉. So I decided that I would tie into and extend the leads to enable me to observe the meter, while cranking. WELL.... As I removed some if the casing if the CPS wire, I noticed that it was extremely oxidized (pics below). I had to replace about 12" of wire and the pigtail as precautionary. The new connections were cleaned/degreased, soldered, electrical sealant spray applied, double shrink tubing (adhesive lined ofc), then vinyl tape, aluminum shielding tape, loom and more vinyl tape. I don't expect to outlive that connection 😉😆. Truck started right up and runs well. 👍 What I find interesting is the presence of a third wire within the harness, running alongside the two used for the CPS circuit; do they use the same harness for the 3 wire CPS circuit, I wonder? Also, all that white powdery residue; is that something original to the manufacturing process? I've never seen it throughout a harness, like this...
My guess is that the third wire -bare is part of the shield . At least that's what we had in the power company substation control/metering wires to the remote computers . alum foil covering and a copper bond wire. Any strange signal getting in here would confuse pcm .
Alum when it corrodes turns to white powder , copper turns blueish/white . Alum and copper don't get along they corrode each other ,alum is softer and breaks down easier. Add salt and water and dc volts =more corrosion . Thats why you see electrical fittings rated for alum or copper -it is resistant to corrosion .
Dissimilar metals can be a real problem . when in doubt use stainless it has the least reaction . Thanks for the feedback there must be a lot of cps wires going bad the same way .
Also, all that white powdery residue; is that something original to the manufacturing process? I've never seen it throughout a harness, like this...
It's talcum power. Over time the insulation on the conductors will stick to the outer jacket. Once that happens the cable becomes less flexible and can break. The talcum powder acts as a sort of lubricant to prevent that from happening. FYI, talcum power is also the white powder you see after an air bag blows off, it's in there for the same reason.
. So I decided that I would tie into and extend the leads to enable me to observe the meter, while cranking. WELL.... As I removed some if the casing if the CPS wire, I noticed that it was extremely oxidized (pics below). I had to replace about 12" of wire and the pigtail as precautionary. The new connections were cleaned/degreased, soldered, electrical sealant spray applied, double shrink tubing (adhesive lined ofc), then vinyl tape, aluminum shielding tape, loom and more vinyl tape. I don't expect to outlive that connection 😉😆. Truck started right up and runs well. 👍 What I find interesting is the presence of a third wire within the harness, running alongside the two used for the CPS circuit; do they use the same harness for the 3 wire CPS circuit, I wonder? Also, all that white powdery residue; is that something original to the manufacturing process? I've never seen it throughout a harness, like this... 
