Truck struggles under acceleration

[FMS88]

Sounds great. If the Weber is only four years old, chances are the nozzle is clogged. Compressed air may clear it, but often only temporarily because any foreign material still inside can replug it since the end opening is typically quite small. When you take it apart, look for crud on the old part and in places where it can collect inside the carb. Clean out any you find and consider installing a small filter between the fuel pump and the carb as extra insurance. When its back together and any lost fuel replaced, opening the throttle quickly should send a strong, steady stream from the nozzle.