ive had this problem, if you get a hand held tuner and set the idle rpms above 1k it will go away. if that doesnt solve it it might be the exhaust hangers rubbing up against some metal underneath the car which was also a problem i had untill i took it back to the shop and got it fixed.
2007 Suzuki SV650s
2007 GT manual - FRPP hot rod cams, Steeda CMDP, BMR upper and lower control arms, BMR upper control arm mount, Sway bar relocation, SLP Line Lock, Kooks long tubes, catted X pipe,SLP Loudmouths, JLT CAI, SCT tuner, FRPP 4.10 gears, Steeda tri-ax shifter, Nitto 555/r 255/45/18 305/40/18
1/4 ET: 13.33 --- 1/4 MPH: 109.06
race weight: 3606lbs --- 332 HP - 306 TQ