I have had a problem for some time that I haven't worried about until now as our kids are picking up the car in Greece and driving through Italy. while accelerating the car starts to pulse jitter back and forth like its a fuel/ignition problem, Im not sure if its an auto transmission (pure drive) issue or something else. my mechanic said it could be the coils however im not convinced of that as I can make it disappear by lifting pulsing the accelerator once or pressing the sports button on the shifter and it only seems to do it between 2-3 gear. Any thought what may be the problem or dignostic technics I could use. odb2 shows nothing wrong.