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Q:

no power first 5 secs then picks up on 1999 Chevrolet Express 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
changed spark plugs and wire,distributor cap,fuel filter,rotary button,air filter
(1) Answer
Oxygen sensor...definitly...had the same problem and it drove me nuts u.til I figured it it out