I have a wesco gas furnace, I understand that wesco is no more. Is there any parts company that can match parts for wesco furnaces.

A lot of furnace are universal,, and/or can be replaced with others parts from different companys,, what are you looking for?

I am looking for the main gas valve assy. My furnace tries to lite two or three time before it will ignite creating a small combustible pre-ignitions.

If you are looking for just the gas vavle there is most likely a universal valve that will fit your needs. However, it doesn't really sound like a gas valve problem. May want to have it looked at by a pro. I really think you would just be wasting your time by replacing gas valve. However, if you are looking to replace the burners, then you may have a hard time locating them. May be time to suggest looking into a new furnace. Oboslete parts, and the headache of finding parts for a discontinued furnace can be very frustrating. Please let me know what you think. I will try to help if possible, but you may be dumping money into a dead horse.