I have a sewer smell coming from my heating vents is there anything I can use to get rid of it?

I have a sewer smell coming from my heating vents is there anything I can use to get rid of it?
The first thing you must do is determine whether this is a plumbing problem or a mold problem. Unless you have a drainage leak next to the air handler intake or a leak above the ducts I don't see how sewer gas could enter the duct system.
No matter what it is you're going to hafta track the smell back to the source.
Start sniffing! Good luck and keep us informed. Tom