Another very jumpy / touchy but otherwise great little Jeep. Had to fix it, and a little clamp on extra throttle arm does the job. It slows down the butterfly opening rate from 12 degrees per 5mm of throttle cable pull to 6 degrees per 5mm of pull, but only for the first 20 degrees of opening and then it disengages and back to standard operation. Details and photos attached . I fitted this over one year ago and it is still working well. Hope it fixes your jumpy problem. I was going to bolt it on , but no drill owned by me would even scratch the throttle arm, must be hardened or toughened . Best Wishes EX Jumpy Chris.