ok so i've replaced my plug wires and fuel filter and have notice the vibration started to fluxuate on where it wants to appear. When i get on it the engine seems to loose power and come back, the vibration appears randomly through the rpm. Up until recently it only appeared at 2300-2500rpm. Could this be a fuel delivery issue such as a dying pump or bad injector? For the most part it still likes the 2300 to 2500 rpm range to show up though.
