Sometimes slow takeoff
Back a few months ago I picked my 1998 Buick Lesabre with only 48,000 miles in awesome condition. Of course it needed both lower and upper intake gaskets. Fixed those and they're working perfectly. I also did a tune-up (plugs, wires, air, & fuel filter) last week but I still can't pinpoint why my car has no get-up every now and then.
Example: I take off from a red-light pedal halfway down, the car accelerates slowly, almost like taking off in second gear in a manual transmission-equipped car. It'* hard to predict when this will happen other than sometimes after the car is warmed up. When this happens the engine will not increase RPMS but still runs smoothly. Someone mentioned TCC to me but doesn't that affect the car more at Highway speed? It will barely go up a hill when this happens unless I pull the shifter to "1," even then it still feels like there'* not much power.
Any help is truly appreciated!