Update:
A friend of mine who's experienced with oil furnaces advised me to bu a new furnace unless the unit is less than 10yrs old, in which case should replace the combustion chamber. He doesn't work in Connecticut so other than advice over the phone he can't help me any further. I'v decided to replace the unit, which is a Heil NUOD084EF01. I'm not sur exactly how old it is, but it looks more than ten years old to me. So called a distributor and he told me the replacement model for this uni is NOMF105 and he sells them for about $1300. I'm having troubl getting prices from any of the others I've called though. They jus give me the "we can't tell you the price unless you are a contractor bull****. Nice little monopoly if you ask me.
So, I was wondering what I should expect to purchase one and have i installed? It's an easy access location and as far as I know th ductwork will match up to this newer model so the install should not b very complicated. I'd appreciate any advice on what this may cost. am in the central Connecticut area and its getting cold here an everyone's busy. This could not have happened at a worse time.
Thanks to everyone who contributed advice so far, a lot of goo information here
-- Romwar