[98dodge2500]

I am new to this site and was checking it out for rough idle info. I seen some info on mabe a sensor may be full of carbon. I took my air cleaner off and was checking it out. I opened the butterfly up and looked down and I have no idea why but it locked like something was grinding groves on the inside and wore a hole between the two I think they are called throttle body??? Any way I will post some pics and if any one can tell me what is up that would be great. Also is this normal? Or common? thanks

 

[98dodge2500]

Oh yeh it only has 50,000 miles on it and it is the 360 motor. If you look to the right side under the butterfly there is a small hole wore between the two. Also you can see the grove under that hole.

 

[98dodge2500]

Any one?? Please help me out. thanks