Corolla rough idle

While I was stopped at a light, suddenly I heard a terrible noise, like a muffler was gone. I thought, “boy, someone needs to fix their car.” When all the cars drove off, and I was the only one there, and the noise was still there, I realized it was my car that was making the noise! The mechanic claimed he couldn’t find the parts needed and they had to be manufactured in California and sent to Ohio, which took several days. He replaced the whole exhaust system as a part had rusted through. The receipt from Denver said, " Found dirty throttle body, restricting air flow. Cleaned throttle body."
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tomgreen → the same mountainbikewell the rarends on these have clutches in there forthe posi trac and