Sounds to me like you have a vacuum leak, and your fuel pressure isn't high enough. What do the plugs look like? What's your pressure at? Do you have a propane torch? If you do, turn it on high, but don't light it, and point it around the TB gasket, and everywhere else there might be a leak, while the engine is idling, and listen for the idle to go up.
Take care,
~Chris
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