1995 Toyota Previa Question: My 95 supercharged previa acellarate sluggish like holding back

Did Full tune up also change airflow sensor exhaust feels like its not breathing but doesn't miss fire it's not getting the full power i even change the supercharger samething it idles fine just not acellerating the way it should more like 65% of power I had a spear transmission and change that 2 samething did comp check what else can I do