Fuel tank not venting correctly?

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MICHAELP

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I have a 92 celica, and if I drive for awhile, the car will start bucking, and eventually stall whenever I come to a stop. If I drive without my gas cap on, it runs perfectly fine. I had a venting problem a few months ago, and replaced the gas cap(it is a venting cap) and it solved the problem, but not it's happening again, I don't think the cap is the problem since it's new. Where else does the tank vent that I could check? and how can I clean it?
 
The gas cap should vent it correctly. If you are having the same problem, back up and start again where you did before. If it runs fine when you remove the cap, then replace the cap again; parts have warrantees for just that reason; they fail sometimes. The emissions system will draw vapors from the tank if needed, but the caps venting capabilities out-do the emissions system, making it an unlikely source of your troubles.
 
That car really doesn't vent the gas tank and I'm surprised the vented cap didn't trigger the CEL. All gas tanks since the eighties are part of the evaporation systion. EFE and that's the only venting they get, except the vent that is activated when you push the gas nozzle into the filler.
 
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