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When I first start my car up it idles just fine, but when I start driving and come up to a stop sign I put it in neutral and coast for awhile, and while I'm coasting the RPM's stay around 1600 until I come to a stop, and then they go back down to normal. I've also had the RPM's fluctuate up and down while coasting but it always goes back down to normal when the cars not moving. I just put on a new throttle body and plenum and I have a tuner with a bama tune, but I'm pretty sure I don't have a vacuum leak. Could this be part of the tune?