1968 Buick Electra no performance at medium speed

1968 BUICK ELECTRA
140,000 MILES • V8 • 2WD • AUTOMATIC
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ECMK478
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Engine 430 4 barrel. Engine is not accelerating at 1/4 and 1/2 load condition. At Idle speed and up 1/2 load it's running strong. I already checked the ignition. Recent engine tune up. Replaced fuel pump etc.
What else could I check? Thanks
Oct 21, 2008 at 8:30 PM
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