AOA,
I have recently started having this issue with my car, I went to get the tuning done, and get my AC gas refilled as it was doing low cooling. After they did the tuning, I took the car for a drive and I felt the throttle not coming down when I leave the accelerator. With AC on, it is VERY high, but it's pretty much noticeable without AC too. I have spent three days with the mechanic to troubleshoot the issue, the mechanic changed the whole throttle body thrice, changed the computer thrice, changed the oxygen sensor, there's another sensor (MAP/MAF) near the throttle body..replaced that as well but NOTHING is solving the issue.
Took the car to Suzuki also, but they refused to take Japanese model. Tool it to another mechanic, he said it's possibly an issue with the gears, went to an Auto Gear workshop they said there's no issue with gears.
Nobody can understand what's the issue, and I can clearly feel that throttle isn't working as it should, if I put the vehicle in D gear, it accelerates itself...even the gear goes into second (this is how much it accelerates)...it reaches the speed of upto 40-50km/h all by itself!
Any suggestions?