ok heres the problem, while turning, stopping, hitting any object or imperfection, going uphill my engine sputters and the check engine light flickers untill the truck stalls. I cleaned the recently replaced fuel filter and checked the fuel pump and based on what i remember fromt the last time i looked at the pump it looks the same, ie: hoses all attached pump functioning etc. Does the return line stop after passing thru the top of the pump/sending unit housing? thanks in advance for any help.

89 K5 Blazer,TBI 350, 700R4, 6" lift, 40" groundhawgs,3/4 ton 14 bolt rear, 3/4 ton 10 bolt front, 4.88:1 Gears