[mustangman65_79]

Mine used to do this, I tracked it down to two things. One, and most likely it, was the carb. I found out that it was the wrong size and let too much air bypass under the carb. I fixed my stock carb, bought new gaskets, and tuned it, also replaced the pcv valve, yess, you still need it for your vave covers. The other thing was the fact the I just put in new Cherry Bombs and think that the unburnt gas stays in the muffer. It makes a really nice big flame out of the tip, I got a two - three foot flame out of mine.