Stalls when transmission is shifted into gear?

This car when you put it in gear, it's having trouble starting but once it does start it rides rough for a second and then purrs like a kitten in neutral and impart then soon as you put it in gear jolts to a stop I seen a post that you made a while ago about pulling some plug could you tell me exactly where that is on the car if you get this anytime soon like I don't I have no idea it's on a two track and I don't have anything to really work with except for a small toolbox and maybe a standard Jack so thank you for your help.