well as a first timer to the z owner club i am fairly new to most problems. I am findings fixes to most all through piddling and playing. But the one i canot grasp is why my '78 280 will not idle. It will start as long as you give it consatnt gas, while it pops and misfires, but as soon as you take foot off the gas she dies. I've checked fuel/air filter, air mass meter, plugs wires, can't get a good timing check because it won't idle..Any helpful hints would be appreciated.