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Q:

2000 Chevy Express Van has total lack of power when accelerating on 2000 Chevrolet Express 2500

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Have already tried replacing the fuel filter, ignition coil, and fuel pump. In that order. There is no check engine light that comes on.
(2) Answers
sounds like the cat converter is clogged. have it tested at a shop. you have spent a lot of money on parts that did not fix it. just make sure your next guess is the right one.

Roy