Check you oil level. If it is high, this can cause issues.
I had this happen to my car last year and it sent the idle even higher than yours. If I stopped at the store after driving for awhile, then got back in to drive, the engine would idle extremely roughly.
Because I had stupidly overfilled the car, the oil foamed and wreaked major havoc.
I had to completely drain the oil, then refill.
Once I did that, everything was fine.
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Borla S-Type | Motordyne | Z1 (lots) | South Bend | K&N | Nismo/Nismo S-Tune | Eibach | Aerojacket | Fujimara | Spl | ZSpeed Performance | Kenwood-Infinity-Sound Ordnance | Whiteline | Ecutek | Hotchkis | Clazzio | VQ Vortex |Morimoto XB |Dynosty Tune 329.64hp 265.73 ft/lb
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