This truck was a dual fuel but the Gasoline side is not used. It starts and revs up, after approx. 30 seconds it begins to lose RPMs. And is sluggish when accelerator is released and depressed. I have replaced the distributer, fuel regulator, throttle stepper motor, fuel filter, air filter, hyd. lifters. tank fuel pressure at reg. is 125 psi. checked for vacuum leaks. I found several wires in the engine harness broken and repaired them. I have looked for more breaks but haven't found any. Compression is 120-125 psi. 17,000 hours.
Just now it showed 54-1 error code.
Anyone have any suggestions?
Thanks
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