One of my students is working on his 292 and we cannot get the thing to idle?? I will run as long as we are giving it gas and keeping the rpm's up but it will not idle?? We had one carb on it that had a very loose throttle shaft (big vacuum leak) so we changed it to another. It ran better but still no idle? Found a vacuum leak on the carb spacer, fixed it and again ran some better but still wont idle. It seems to me like we still have a massive vacuum leak somewhere but am having a heck of a time finding it. Could it maybe be the carb is that far out of whack? Adjusted the air fuel and idle screws to no avail. In addition, this thing is making real low vacuum, if I remember like between 10 and 15. What are your ideas? thanks-