Resistance check all sensors per fsm hot and cold.
Voltage & resistance check at the ecm via back probing per fsm hot and cold.
Double check for vacuum leaks hot and cold.
Verify proper egr function and egr bvsv function per fsm hot and cold.
Check spark and pick up coil hot and cold per fsm.
Leak down test hot and cold.
Compression check hot and cold.
Many of these tests overlap, but that’s the point.
I suspect the Ne signal will play a part. The wires drape right over the the exhaust manifold then thread through the heat soaked intake manifold and have been there for years. Heat=resistance which is bad for electrical sensors and should show up in the tests above.
The hot and cold leak down test will give you the answer as to anything mechanical.
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