Well, if you got the time and the money then I would suggest doing all the o-rings. If not then you could just do the ones on that side of the motor. Just remember to lube the o-rings before you put them in the intake and back into the fuel rail. If you have never done this before its real easy and you should be able to figure it out.
Yeah it could. If the fuel aint gettin to the engine then you arent going to get smooth acceleration. If that doesn't fix it then I would turn to basic tune up stuff. Plugs, fuel filter, seafoam, etc.