I have a weird one here. I have a manually injected 8.3 cummins in a 1993 ford f800. When shortly after it reaches operating temperature it spits, sputters and stales. It runs great until then. I did new injectors, lift pump, checked lines, fuel tank, shut off solenoid. I did notice it doesn't get up to the rpms it used to before I can shift. Please help Thanks
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