Since it wasn't doing this before the tune I would suggest contacting ION and let him know what it's doing. There may be a lean spot or a timing transition that needs to be smoothed out. I also agree with peeps above that you shouldn't be running RPM's that low. What do the specs on the cam look like? Another thing to look for is bad plug wires. If you open the hood at night while the car is running and inspect all of them you might be able to see if any of them are arcing.
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