When under the hood and tipping the throttle, when it bogs, try whiffing it with some carb cleaner and see if it picks up, it would verify it's a fuel issue. When it's bogging, spray carb cleaner around the base of the carb, intake manifold mating area to the cylinder heads and any other place there could be a vacuum leak.
Be careful because carb cleaner is flammable, a bad spark plug wire can light it up right now so keep it away from them. I keep 2 small fire extinguishers available when working under the hood. It can happen to the best of us in a second, please be careful
If it continues to falls over once the throttle is depressed, verify the accelerator pump is functioning correctly and is providing the correct shot. If you don't find anything there, verify the EGR is coming in at the correct time and isn't stuck open causing a vacuum leak.