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Dropping, like dropping below the normal idle rpm. RX-8s normally idle around 800rpm, usually anything below that the car does tend to shake a little more noticeably. Maybe your motor mounts might be going bad also, but definitely take it in and have it looked at. Maybe another thing to check is for a lose or disconnected vacuum line on your intake...that could cause a rough idle too. Not sure though, just trying to give some other options to look at.
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04 TiGray RX8 MT, LS2 coil setup, 3" midpipe, HKS Hi-power 3" exhaust, TEIN S-Techs, Hotchkis Adj F/R sways, K&N Typhoon V2, Steel braided brake lines, Redline drivetrain fluids, ATE Super Blue brake fluid, Cobalt XR2/GTS brake combo, MB Motorpsorts Weapons 18x9 +45 offset, 275/35's
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