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Scotty,
The mechanic said the other thing it might be is the contacts in the throttle body, giving them a good clean might solve the issue. Won't cost you anything to try!
I had a similar problem a few weeks back, the mechanic told me it was one of 3 things;
Accelerator pedal
Throttle body
Wiring
I told him to try the pedal first since it would be the cheapest option (~£50), the new pedal has been in for a few weeks now with no further problems.
Hope this helps