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I need some help. I run a 2001 3500 2w drive dually 5 sp pulling a 40 gn trailer. Starting friday afternoon, my truck would get sudden power loses, usually in 5th gear. It will surge several times then resume operating normally. I might drive several hundred miles then out of the blue it will start surging again. I depress the clutch to see if it dies but it just goes to idle. When it's running right there is no problem, no lose of power and no misses.  This is what I have done to it since march, I've put in a new lift pump, we have some wiring issues to the lift pump which was corrected and the block pump is completely out of the picture. The lift pump is an in tank model. I checked the lift pump on Saturday and it's putting out 15psi at idle and 13psi at 2000rpm. The only code I get is a 1593 but when I put my odbII reader on it it shows no codes. I have replaced the TPS couple of months ago, I got new bosch 40 horse injectors with new fuel tubes. I would say that there may be a short in the electrical to the pump but it would die  when I clutched it but it doesn't just goes to idle with no misses, normal rpm. I am wondering if the lift pump is going bad and is slowing down causing the pressure to drop, the engine can idle on lower fuel pressure but not run higher.

 

I'm at a lose, any suggestions would be greatly appreciated.

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