wha is the timing? on 1994 GMC Vandura 3500

when i goin the the hiway and is an slope , the speed go down drasticly from 65 to 35 mph., lus power..

by in Farmington, CT on April 27, 2011
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1 answer
ANSWER by , April 27, 2011
sounds like a clogged cat converter. take it to a shop for a check to verify and a bid for repair. Roy