hey i have a 01 Chevy blazer iv done intake gasket,egr tube ,plugs, distributer cap and router, fuel filter,plugs cleaned throttle body and maf then i had po155 code so i did a o2 sensor bank 2 sensor 1 i think that's what po155 code is. hoping it would fix it. the fuel filter stoped it from sputtering and hesitating until i filled the tank again i thought it was bad gas. the blazer still hesitates and sputters at wot or under a load. idles fine runs good starts right up last time i checked the fuel pressure it was fine (2 months ago) i dont know what else to do its driving me nuts. if someone could help me out it would be greatly appreciated thanks for your time.

 

I have a similar problem with my 99. My friend hooked his diagnostic computer to it and it showed that the Fuel Tank Pressure Sensor was showing a code. Im trying to find anyone else that has dealt with this as well so I know how much it costs and where it is. I hope this kind of helps,lol.

 

Sounds like Throttle Position Sensor (TPS)
When you press the gas pedal the needle in the TPS moves, sending a signal to the computer to send more fuel to the engine. If the TPS goes bad there will be a dead spot(s) and when the needle hits that dead spot the computer will starve your engine of fuel causing the sputter/bog.

 

Wouldn't that show up on the computer? I am not doubting you, just saying if it were the problem I think it would show up on the diagnostic. I can live with it for the time being but it is something I will surely fix in the coming months.

 

Spider injectors might be going bad

If you know how to do a injector balance test

 

Any codes? Does the CEL flash when under load or WOT?