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I have a misfire on a t444e. The truck starts acting up after it has been warmed up and ran for a bit. It does not happen at any specific rpm or under load, it just gets progressively worse as you drive. Sometimes will even stall. I changed the fuel pump and filters, but that did not help one bit. Any suggestions?
 

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You may have a bad O-ring on the HPR or have a weak HPOP. When the engine warms the oil gets thinner and can sneek past a weak O-ring.

Plug into it with a diagnostic tool or laptop with software and look at the IPC pressure it may be dropping off
 
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