If indeed it starts with a jump from another vehicle, and assuming you are connecting jump leads to the battery, then the only thing you are by-passing is your own battery so unless we are missing another piece of info are you sure your battery is 100%? Cars like these,especially as they get older, need a good battery that can spin the engine over with conviction. Try disconecting your battery and clamping the jump leads directly to the disconnected terminals, does it start fine then?
Other than that your original post shouted 'air leak' to me particularly if the engine light comes on on full chatter.
Half a turn on the mixture screw is one hell of a lot by the way.
Another outside possibility is that the meter head is leaking into the air box. When the idle is set it is with the engine using some of the fuel from the leak which then is not available on start up only a weak mixture from the injectors. This invariably creates issues with trying to set the engine at idle.
I can't possibly see that a rolling road would be of any significant help but it's your call
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