Van stalls and runs rich

got a 1986 chevy g20 conversion van and im having a problem with it once in a while it will stall out after putting it into gear it does not do this alot but it does happen also smells like its running rich and untill it warms up while the van is in park you can hear a intermiten click sound goes click click…click…click no real rythem just kinda does it then stops when in any gear besides park friend said it could be a small backfire
thanks for the help
the engine is a 350 V8 4 barrel carbed

and its a automatic so im not the one whos making it stall also the fuse for choke has a red wire coming out of the fuse box were the fuse is pluged i assume it goes to the choke