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N-14 rpm surges at 1000 rpm

I put a used N-14 celect plus into my 98 Pete 379 that I bought from a scrap yard. The engine ran great for the first ten thousand miles then started pushing water. Did the head gaskets and when I picked it from the shop at 1000rpm It will drop to 800 and then recover. Just like you were sitting there jabbing the throttle. I took the truck to Peterbilt and there cummins guy spent a week on it and in the end was told that they had no clue. Tested the engine position sensor they said it was good but I'm thinking I should replace it anyway. I don't know I'm completely frustrated about it. Spent 2000 already trying to chase the problem no one really even knows much about them at the shops anymore.

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They replaced some parts in the fuel pump but that was money wasted it made no difference. And I agree with you 100% how can they charge for something they couldn't fix. At least they stood good for the N-14 badge the mechanic peeled off the rocker box. I'll book it in at cummins next time I'm at home. I have that truck parked for now.

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'''Your always better off taking strange problems to the engine manufacture shop. I would take it to Cummins and let them figure it out and I would go back to the Peterbilt and ask for a refund. How can they charge you for something they couldn't fix. I would ask to speak to the regional Peterbilt rep too. You might not get all of your money back but it's worth a try. If they couldn't fix it they should have called Cummins and brought in a factory rep.

I would think that your problem is either in the fuel pump or the ECM. 'italic text''

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Mike will be eternally grateful.
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