sounds like your clutch is starting fade...
there are some cheap cold air intake's on ebay...
I'm sorta new owning my 88 prelude 4ws since March
check out preludepower.com
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They have more info on 3rd gen (88-91)preludes like our's
fix that intake ...your not driving it without an air filter?? are you??
go look on ebay for cheap intake $20-30 - got to have that filter...