time for a tune up...
Mine use to do it when the car started up when it was cold. Had no power and missed like a bitch till it heated up. How many miles are on your car? This started on mine around 53K. Now at 59K I've done just about every ignition upgrade without going MSD DIS-2. Go get a fuel system treatment at the dealership. Injector cleaners don't do a whole lot. Might even want to replace your fuel filter too. These should be replaced every year. Atleast by my standards. When i put her into storage this fall, after fixing the vaccum leak, and other stupid shit.. When on a hard acceleration she's moved like a bad outta hell.