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How long since a tune-up? Include air filter, fuel filter, gas injector cleaner...Also check the Idle Air Control valve on your 3.4 V-6...It can be dirty or clogged over time...Located on the air intake plenum...your auto parts store can also show you a diagram...Fuel pressure must be constant also, your Firebird is worth having the fuel pressure regulator checked, as well as the fuel pump...
It sounds to me that the clutch material in the transmission might be breaking down. Before too long I would have the transmission rebuilt or replaced. If you wait too much longer the transmission will start to slip and pretty soon you will have NO gears but first and reverse.
Just a guess, but it sounds like an internal valving problem (pressures inside are being mis-directed likely by valves that are not closing all the way) This can cause damage to clutches as they are fighting against each other to move the vehicle. It should be checked by a reliable transmission shop immediately. (they have the proper test equipment to determine what needs to be done...(transmissions are not "user friendly" for repairs other than filter service and external adjustments)