Kung todo ang diin mo sa accelarator pedal during accelaration at walang kausok usok sa exhaust pipe, then your problem could be relation to fuel starvation (fuel filter, clogged fuel lines), if meron lots of black smoke, then most likely the fuel system is ok, it could be an late injection timing, or restricted air intake system (look for clogged filter, restricted air hose, turbo)

Hope this can help