Any codes ? The 99 needs a code reader plugged into the obd port under the dash. Any auto parts store can and will lend you a reader for free or a small rental fee. You need a fuel pressure gauge with these vp-44 powered Cummins trucks. Also, you need a better lift pump as the stockers are JUNK !! I know you said your done throwing money into it but you why spend $1000 for a new vp if you don't have too !!! Get a better lift pump and fuel pressure gauge ASAP. Check into Diesel Auto Power for lift pump and gauge kits. Google them. Very good prices too. Stay away from Airdog. I'd go with a FASS pump and a Isspro gauge and use air brake line with a needle valve as to not damage your gauge from water hammer from the vp. You can connect your gauge line onto the fuel filter canister also. Google Mopar1973man website. That guy is a Dodge Cummins Guru for sure. Tons of info on there. Sounds like your low on fuel pressure at WOT. Good luck. I have a 02 Cummins and it has a good lift pump and gauge set at 20 psi.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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