Check the fuel pressure. Put a t connection in the existing line and run a gauge to one of the windshield wipers so you can read the pressure when you are driving it down the road.
I would suspect several possible things but need to see what the fuel pressure readings are first, could be a partially plugged fuel filter, weak fuel pump, bad air flow meter, or throttle switch and several other parts so get the pressure reading before you start throwing parts in a hit and miss expedition.
regards
Mech
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