Why does idle go high and low and seems to shift down hard
Check air filter and clean throttle body. Clean or replace Idle Air Control valve or mass air flow sensor depending on which one your vehicle has. Replace fuel filter if have not done so in a while add fuel injector cleaner to gas tank and use the middle grade or high test gas to help clean out the gum and carbon build up.
Search Dodge Ram 1500 Questions
Dodge Ram 1500 Experts