I've found a lot of threads on this topic, and they've been great info so far, thanks to all! However, I wanted to create a new thread to clear a couple of things up - hope that's ok! My 310 is my first Caterham and I have had it a couple of months now and love it! However, it has been reluctant to start and the idle is a bit volatile, almost throbbing where it seems to dive to a low rev and then tries to recover over revving and then repeating for a bit till it settles. I have Easimap up and running, so can see the throttle site and angle increasing, and it was at 0.3v at site 0.0 and from what I understand my car should be around 0.4v at site 0.0. Is that correct? I have adjusted to 0.4v (having reset ecu with battery disconnect), but it still wasn't quite right, but better. I understand that the idle screw has a part to play, and I am not quite clear how to balance the two, and was wondering if there's any trade secrets to share? I can tune the idle, which changes the voltage, reposition TPS and reset ecu, but I don't seem to get a steady idle and the throbbing when idling remains. Another aspect could be the lambda sensor (from my readings), which I haven't explored yet, but given the age of the car I'd be surprised if it was faulty. Thank you for your patience and help!