It will only get worse and get hard to start and eventually quit running.
If the RPM sensor goes bad it sends no signal and the ECM (electronic control module) thinks the engine is not running and shuts everything down such as spark and the fuel pump.
This works this way so if the truck is in an accident and the engine stops but the key is still in the run position and the RPM sensor is not sending a signal the ECM any more since the egine is stopped the ECM will shut down the fuel pump to keep it from pumping gas all over the pavement to prevent a fire.
I've replaced a many of RPM sensors on Ford and Chevy Diesels. The dodge sensors are a little bit more complicated to replace though.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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