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The IAC "Idle Air Control" will maintain a set rpm that the computer is looking for. That is why you can let the clutch out with no throttle input on modern engines and they won't stall if you feather it enough, as soon as the rpms drop the IAC opens up a little to try and maintain the set rpm. Since they are on very modern engines and sold by DIYAutotune to go with the MegaSquirt, I would think that it should be part of the puzzle if you want a smooth runner at all temps and loads.
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Jeff
'73 GT,5spd,Recaro,EDIS4 2.2 EFI by MegaSquirt, Ali Flywheel w/S10 Clutch, Electric Fan, Roller Rockers, Venolia Pistons, 6 Cyl Intake w/ Custom Injection, 15" Wheels,Lecarra,F&R Sway Bars,Custom Exhaust,1" Sport Spring,Koni Reds,Big Brakes,3 Core Ali Radiator,Hse of Colors Kandy Pagan Gold.
 123 WHP @ 6800 RPM
'64 VW Karmann Ghia
'08 BMW M3
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