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2000 Tahoe, replaced fuel pump, filter, plugs wires, map sensor, mass air flow sensor, throttle position sensor, and o2 sensors, vac lines

And cleaned the fuel injectors, still not running right. It starts but when I press the gas it bogs down. Any ideas from a mechanic out there. I have had it on the computer and no codes register

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The bogging down is mainly caused by a weak fuel pump or a bad throttle position sensor. Since you made most of the replacements, it would be wise to check and see if they are well placed. If nothing works, check with a mechanic.

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It all started after I changed the fuel pump. Im starting to wonder if I got a defective pump. Thank you for your help
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Also Jeff it will run without a problem until I plug in the mass air flow sensor then it dies. New sensor though.
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Check the timing?
can you feather it out to 1500 RPM? at all? above idle? If you're not getting codes it could be a bad control modual. it controls firing and everything else.you should get codes.

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When it gets going it will go a few miles an hour then sputter then it kicks in full power. Only if I have the mass air flow sensor unplugged though? Im lost and dang near broke with experiments lol
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