I have an Audi A4 2.4 V6 2002 automatic which has no power and there is a popping sound. It idles perfectly but when you accelerate there is no power and when it starts moving I have to change the gears manually but that also is difficult.. The engine was recently reconditioned so I am at a loss. I tried changing the plugs but it still pops. I need assistance

 

Sounds like the transmission clutches are going out. Check the transmission fluid.