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I have a 99 dodge 2500 first diesel and I know nothing about these trucks. The truck will start and run fine till it gets warmed up then I lose the rpm gauge and the engine light comes on and the truck starts to run rough. It will not start till it sets and cools down. It will start back up with no engine light and run then the same thing once it gets to a certain temp the same stuff. New lift pump and new vp44. Any advice would help tia
 

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Welcome to the forum...

First off, its very helpful if you list anything and everything about the truck and create a signature for quick reference in the future to help with your questions.

Second, the '99 only allows codes to be read with a code reader so thats the first thing you need to do. Most parts stores will rent one or scan for you. Or, its not a bad idea to have your own scan tool. A decent one that tells you most of what you need to know run about $100.
 
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