I have a 2002 dodge ram 1500 4.7L, when i start it or rev it, it takes forever to idle back down and during idling down it'll rev back up a little bit then go back down to normal idle

Hello, most abnormal idle concerns are due to a fluctuation of unexpected air for the intake manifold - causing the engine speed to raise. Or, an accessory that is not working properly is causing abnormal throttle up of the engine. Either way, you'll need a hands - eyes on assessment to see what is happening. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops