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Q:

my engine loses 2-300 rpm when kicked in to passing gear. on 2003 Chevrolet Silverado 2500 HD

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I have replaced the rubber fuel lines. the check engine light came on but went off before I could read the codes.
(2) Answers
Codes are still there, unless you have removed the battery cables for some reason. Computer has a good memory!
Turbo working?
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