Hi

Sounds a bit like what was happening to my car. It was stalling when I put it into gear and increasing the idle didn't make a bit of difference and couldn't find any vacuum leaks to the carb. My dad suggested I adjust the timing. Advanced it a bit, and now the car will stay running when I put it in gear. I hardly know anything about engines, so don't know if that could be the problem with yours, but just incase I can help....