i had the same problem once tanis, i moved my grill and one of the venturi tubes (the bent hoses that are under the the panel that connect the dials or valves to the underside of the burners) came off the inputs to the burners, so it was spewing gas underneath. unless you're good at assembling things and have the instructions for the grill, i wouldn't try to re-attach them. they have to be put on the burner spigots correctly, and then adjusted for a good flame. ask the local propane guy (i think his name is hank hill) if he makes repairs and adjustments on grills. be careful, you could end up a crispy critter if you do something wrong...
in nomine patri, et fili, et spiritus sancti.
beidh ar la linn.
wisdom is often in short supply within ones' ego.