My 2000 Dodge Ram keeps dying, does someone know why?

Sounds like a combination of a failing fuel pump and an engine running rich meaning too much fuel and not enough air. Try cleaning the air filter and changing the spark plugs first. If that doesn't completely fix it then change the fuel filter as well. Also don't run premium fuel in it as this will force the motor to work harder to burn fuel. Also 500 rpms is really low. Manual transmissions need to run at higher rpms or they die. Also in a rare case it could be a bad clutch,