Question about 1999 GMC Sonoma
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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Posted on Jan 02, 2017
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