Argh... it came back again, but only once. Went home, turned car off and back on and it went away.
I somewhat doubt it's something mechanical like the throttle shaft, otherwise it won't improve just by reattaching the intake like that and turning car off, doesn't seem to make sense.
I think I might try going back to stock and see what happens first.
2006 Solstice I4 2.4L "Kristin", Dark Tarnished Silver Metallic, 1SA+PCQ+G80+JL9+ZQ2+ZQ3
Mods: Kappasphere kappaATTIC, Kappasphere kappaShield, JPM Seatbelt Loops, FIAMM Freeway Blaster Dual, LED footwells, GMPP CAI
2012 BMW 328i I4 2.0T, Mineral Gray Metallic, 7AC
Life moves fast, don't miss a thing.