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What year truck and what engine? I have a poweraid TBS and never had a problem. Did it come with new gaskets? Maybe you disconnected a hose or something by accident?
Not sure what it could be, but if it started after you added the TBS, its probably something loose not the TBS itself. Does it stall right away? Check your MAF connection. Hope that helps.
Dump the TB spacer, they do nothing. That should take care of your problem!
I must strongly agree. The throttle body spacers and tornados do nothing but take up space. If you are looking for more hp, get a performance chip (diablo), air intake (airrade, mac, k&n), flowmaster or gibson muffler and a dual electric fan.