I lean on a topic in fuel feeding. It could be from the simplest as saturated fuel filter, to the fuel pump for dying. Several things can happen within this option. First of the pump itself is generating less pressure from the necessary and on the other hand it could be that the pressure regulatory valve is not sealing well and it does not have enough pressure. I lean on bomb in poor condition or regulatory valve. To get doubts, get a manometro and measure the pressure on the injection ramp. Ovbarily, there may be countless problems that generate similar situations. What should you be more detailed when explaining the fault: the engine once starts perfect? Regulates well and even, you already go around, when accelerating reacts well? Sometimes it is accelerated? What I advise is to look for the problem and do not play to change pieces until you find the failure. Greetings and luck