Originally Posted by hpdcsi
The wire is bubbling. On wet, rainy days, the truck will kill as the rpm's lower. (ex slowing to a traffic light)
OK, I don't mean to "Rain on your diagnosis
" here, but that doesn't sound right to me....
You have "bubbling" insulation? And feel like the dampness
of a rainy day (because up at the top of the engine, in the valley, certainly no water is getting to it) is causing the low voltage to "leak" and send the PCM misinformation that causes the engine to die? That seems pretty unlikely....
Unless the insulation is actually gone, and causing the bare copper wire to connect to ground or short with each other, simple humidity is going to have little effect, and would be just as likely to short on dry days too. High Voltage (like spark plug wires) might do that, but these sensor wires aren't going to.
I gotta think you've got other problems, unrelated to the condition you've found with those wires & a rainy day.