Throttle body issues won't cause a stall while running down the road, if that is what happened. They can cause it to idle down, though, but there will be codes and should run right after a key cycle. Need more specific info. If the engine is not running, the throttle won't open more than about 25%. There are lots of parameters that control when and how far the throttle will open. I would guess the mechanic has not dealt with one of these systems. While easy to put on, I would not be throwing a throttle body at it without more diag, they aren't cheap. Even with the throttle body disconnected, it should run at a high idle. If it won't run at all, the throttle body is not the problem.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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