I let it warm up for about 2 minutes as it was about +10 degrees Celsius ( about 50 degrees F) which is not any differently than the way I have been doing it for the last five years. This is a manual transmission car and I'm familiar with the fact that it will high idle when cold for a couple of minutes before settling down to normal idle. What I'm wondering about is what would make the idle bounce from 900 to 1200 rpm uncontrollably (By the way, the A/C compressor was not causing this as it was turned off) and running roughly before clearing up on it's own.
I think your right Hotshot, my first plan of attack will be to clean the TB and MAF, as its been about 1 year since I did it last.
2005 black GT premium (5spd) / GT500 front LCA/upper strut mounts / Koni Adjustable (yellow)shocks with Roush Springs / FRPP 4:10 rear gear / BMR rear UCA/LCA+relocation brackets / MGW Shifter / Bassani axle backs / Cervinis heat extractor hood and Ducktail spoiler / Carroll Shelby CS69 20x9/20x10 wheels / MSD Blaster 2 coils / Roush TVS2300 Supercharger+Brenspeed 560R upgrade / Exedy Mach 500 Stage 3 Clutch / Exedy lightweight flywheel / SR Performance braided stainless clutch Line / Afco Dual Fan Heat Exchanger upgrade / JLT Catch Can / Axle Exchange one piece aluminum DS / Silly grin on my face every time I turn the key.