I have a 83 FJ60, all stock with all emissions in good working order (I think), good running motor. Get right at 300 miles per tank of gas, running 31's with a 5-speed transmission. When its driven though, and turned off to run into a store or whatever for 5-20 minutes, get back in and crank it, a weird noise occurs right when I hit the ignition. Like a pressure release noise under the passenger side dash. It has a odd smell to it, like methane maybe, it is not a gas noise. And it does not want to start right away, have to crank it, when it does start it misses like there is air in the gas line. I drive about 5 miles and it runs perfect again. The carb cooling fan quit working a while back and I have been tinkering with it but have not licked it yet. I think if the carb cooling fan worked it would help the warm restart and running rough, but the dash noise blows my mind. It is geeting worse in the past few monthes. Anyone have any idea?? Thanks in advance.