You could try:
With carb cleaner and a swab, clean the throttle body.
When you're down to 1/4 tank of gas, put in two bottles of Techron fuel injector cleaner and then take it out for a high rev run. Don't be gentle, they like this treatment once in awhile. Fill it up with the best gas and change the oil.
Have your injectors been tested/replaced?
I don't think the seat gremlins could be connected to your sputtering acceleration. But who knows?