Some problems with my Dominator
last weekend I bought a '91 Dominator. Everything works fine, except that the engine likes to stop in front of traffic lights etc. I hear a "klunk" or "pooff" from the exhaust and it stops. Also, sometimes when I'm just cruising I hear some pooffs from the exhaust (or I imagine them). It all sounds very similar to what I get when I run out of gas, spluttering and poofing a bit till I put it on reserve. So I figure it may be something with the gas supply to the engine?
What could be the problem and is it easy/cheap to fix?