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i'll guess filter
could be fuel filter either inline or the sock type in the tank...maybe even air filter could be something blocking the air flow at highway speed?
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79 chevy k20 350/350/205/D44/14bFF
4.56 gears rock 
LWB pimer black
01 S-10 ZR2 extended cab
4.3/4L60E/233
3.73 gear 31" DICK CEPEK CRUSHERS
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