My 77 Aspen won't start. The motor will crank, but I'm pretty sure the problem is ignition. I'm getting fuel in the carb, I changed the plugs today, the battery is practically new and I even put a shot of ether in the bowl. Nothing. Anyone got any ideas? I've had this car for 6 or so years, she's been in my family since it had 300 miles and I don't want her to go the the scrap heap. It's the 225 cid slant six.