I get this really loud belt noise from the engine when the car is at stop ideling.. or while I am driving. I let go of the gas and let it cruise.. the noise comes on..

when I am stepping on gas, the noise goes away..


which belt seems to be the problem, I don't want to replace all belts.

this particular car is a automatic.

 

you either need to tighten or loosen one of the belts. to find out witch belt it is just spray a little soapy water on the belt one at a time. when the noise goes away the belt you just sprayed is the problem.

 

dont be a cheap ***, replace all the belts