i'm a newbie needing assistance

[halcyon87]

I just bought a 96 infiniti I30t automatic. recently I had intermitten stalling and took it to a mechanic and had these things done ( TB cleaned, new fuel filter, new air filter, sensors checked, sea-foam injector cleaner). also, my friend told me it could be bad gas so now i make sure i put in 91 premium. but still ONCE IN A WHILE the car loses power at low rpm between 1000-2500 and the rpm rise is not smooth and as fast as the first week i bought the car. when i step on the gas to get more speed it feels like something clogged or it feels like it and like i said before the rpm doesn't rise smooth and fast like it was before. in a way it lags when coming off a stop.