When you had the tank down to replace the fuel pump, what smells came from it? Good time to check it for leaks (I had to have some dime-size holes in mine welded and then fiberglassed over it for added durability). Good time to clean it out and reseal it from the inside. POR makes a really good product for cleaning and sealing the tank.
For more idle issues check the throttle position sensor. TSRM goes through the way to check and calibrate it. Left mine disconnected after some of my injector work and took a long time to realize what why it wouldn't idle.
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