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‘01 Silverado 2500HD 8.1/Allison 5sp xcab long bed
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Howdy and welcome!

11.5psi should not give you problems. However, 30 year old pump and distributor could be contributing.

If it was me, I’d replace the coolant temp sensor, fuel filter, and check the distributor for shaft play and rust/corrosion under the rotor on the reluctor ring.

Hopefully the pressure returns with the new filter.

I don’t like spending other peoples’s money, but a distributor and pump would be on my to do list just because they’re original.

One step at a time, though.
 
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