Hey everyone. I'm very new to this. I recently got Tmax 2.5 with 3.3 engine in it. Got it tune by a local shop first time so I can understand how it works. My problem is that some times car will start creeping up or jumping forward. What is this cause by. I play with idle and still dose it. some times is very bad some times is just once in white. any suggestion are welcomes. The only mod I can see it a metal big wheele on transmission.