i have a c180 sport and the battery went flat and after jump starting it, it hasn't been able to hold the idle. Normally it would start on the button but now I have to give it gas to start it but then it justs drops if i don't hold my foot on the accelerator. I had the same problem about 3 years ago and had to have a new throttle valve installed at a cost of £500 as you can imagine I don't want to have to pay that again. Surely it can't be the same thing again. any ideas anyone?