Question about 1999 GMC Sonoma

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I had new fuel pump installed but check engine still comes on

When the gas tank is full truck bogs down and runs rough at times.

When gas tank half full check engine light goes off and truck runs good.
I had new fuel pump installed recently so what could be causing this problem?

Do I need to have truck hooked up to a scanner to find the problem?

I would appreciate any thoughts on solving this problem

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You could have an O2 cencor gone

Posted on May 11, 2009

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Posted on Jan 02, 2017

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