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P0501....Vehicle Speed Sensor Range/Performance To me it doesn't sound like a faulty speed sensor would cause engine trouble. At most it would throw off shifts on an auto tranny... As you know, a jake-brake works by not igniting the fuel, but instead using the engine to compress the air blah blah blah. So, if you say it sounds the same then possibly you could have a few plugs not firing. Try replacing them, or checking for a spark at the end. Might be a coil pack too? Hope this helps, Good luck jerv P.S. - Question for you: What do you use for an OBD scanner? Handheld? PDA based?
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