car drives nice but i hear this noise under my car
 

car drives nice but i hear this noise under my car its a 1995 blazer it coming from the right side it kinda sounds like knocking but when I stop on the gas it dont go with the engine oil clean no metal it has thick oil in it when I bought it just want to make sure it last long for the wifey

This makes no sense at all..

"under my car" where? under hood,rear etc?

if THE engine is making a knocking sound,its either bad motor,or converter bolts are loose or cracked flywheel. please be exact when asking. helps us all. thanks

Are you married?

yes like previous comments :) there could be a ton of things that could make noise :/ try to find the source of the noise when you hear it or have someone help you from outside of the car and see if they can distinguish the noise from the outside... but if its hard to find the source try to describe better when the noise appears... what it sounds like ;p hope this suggestion helps :p