1.) Muffler bearings are not a real part on a car, he was messing with you...
With that out of the way, it sounds like a throttle position sensor or possibly a MAP sensor. I would also check (or have someone check for you) the fuel pressure.
If you are going to take it to a shop, just tell them you've got a backfire and no throttle response, a competent mechanic will be able to do a few simple tests to determine your problem. Diagnosing over the internet is rarely easy (or accurate)
With that out of the way, it sounds like a throttle position sensor or possibly a MAP sensor. I would also check (or have someone check for you) the fuel pressure.
If you are going to take it to a shop, just tell them you've got a backfire and no throttle response, a competent mechanic will be able to do a few simple tests to determine your problem. Diagnosing over the internet is rarely easy (or accurate)

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