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It sounds as if you may have some partially contaminated fuel entering the carbs. About the only other thing I can imagine that would cause this is a very small vacuum leak at the point where the carbs mount. Carbs have even been known to shake loose at the air horn to main body gasket. Good luck!
Sounds like a dirty air filter is putting the mass airflow sensor out of range. The throttle position sensor is subject to physical wear, the age of your truck warrants replacing it. The coolant temp sensor controls the Idle Air Solenoid which determines idle speed ( cold, high idle, 1200 rpms open loop mode for the ECU) and (hot, low idle, 800 rpms, closed loop mode for the ECU) If the truck does not have a Mass airflow sensor, check the Manifold absolute pressure sensor (MAP). Perform an OBDII scan for stored fault history to avoid buying parts you don't need. Do the cheapest fixes first. Go ahead and change the fuel filter also. There is a lot of water in todays fuels
Try buying new diaframs for your carbs, because of the diafram and piston operation, if the diafram becomes weak due to heat from your engine, and by the diafram not beeing rigid enough, it hesitates to lift the needle out of the jet causing the lack of fuel at low tack/rpm when throttling up or accelerating slowly.
I worked on one of these the other day and what fixed the same problem it sounds like is I changed out the distributor cap and rotor. the rotor can be a pain to get off. and also don't cross any plug wires take one off at a time and put it on the new one.