So you pulled the codes and didn't get any?
OK, how about a cheap/easy test. Pull the MAF, get some CRC electrical contact meter. Pull electronics out, and spray them down good. The sensing wires should be a SHINY silver, not a dull silver.
Do you run a K&N? Recently reoiled?
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it begins to cut out in all ranges... the tach abrubtly falls around 500 rpm and jumps back to the original RPM in a matter of less than a second
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Can you give an example of the actual rpm this happens, and the amount of throttle you are giving it at the time?
How about the TPS, have you checked it for "flat" spots?