I can't get mine to flame from still and like James said, doesn't sound good!
I can only get mine to flame when i'm on the motorway and have a good run to get high revs, then drop them slowly, then plant it. It's great at night cos you see everyone backing away from you. One minute everyone's up your arse then they're happy to let you travel by yourself.
You do need to be running your car rich to get the flames as you need the extra fuel to ignite it. If it's running normally then there's no excess fuel for the flamer kit and you might aswell be trying to light snow.