Hey. I have a non z51 automatic. Wondering if anyone's had same problem. If I'm going ...say 45 mph.....and I need to slow down , once the tachometer reaches 900 rpm, it revs and goes up to 1300 rpm on its own ( I'm not pressing the gas ). If I then lightly accelerate , it shudders a bit and seems to be indecisive about what gear to go into. Once I punch it hard , then it's ok. Is this from the AFM ? When using paddle shift, don't see any problems.Anyone else experience this ???