distributor help

currently running a 93 1.0 with 63000
car has been getting a little hesitant on accelerating above 2500rpm
it is doing this a lot now getting hard to get up to speed
it gives me full power till around 2500 rpm then completly backs off even with foot on the floor its really sluggish
could this be down to the ignition advance on the distributor failing it idles properly and no misfiring checked the plugs and there ok brown/white deposits
any help appreciated
 
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