2012 Silverado reduced power issue

[Bradley William Bumbie Babarovich]

My 2012 2500HD Silverado has a throttle body performance issue and reduced power problem.the engine has no power when you punch it the goes into reduced power.the flow master muffle isn't as loud as it was so I'm curious if it could be a back pressure problem the local dealership said I need to put the stock air cleaner system back on but I've had 5he spectra cold air on it for 4 years and the muffle is 5 years old  anyone run into this problem .I have new plugs ,wires,coils,new mass air flow sensor,cleaned the throttle body, the dealership is just trying to rack up some $$$ not give me a straight awnser after 600 bucks and all they did was change one oxygen sensor and not give me a definite awnser.

[CamGTP]

Reduced engine power will show a code for why it did it.

 

Do you have that code?

 

If it's tied to the throttle body itself it could just be the throttle body itself that is the problem. Your intake or muffler swap isn't going to make it go into reduced engine power.

[MORSNO]

I've had two previous Chevy trucks do that too, it was the fuel pump both times.  I could idle and drive if easy on the throttle, but no power to accelerate fast or climb hills, pump was running but putting out very little pressure.

 

Edited June 13, 2021 by MORSNO

[Bradley William Bumbie Babarovich]

Thanks guys I appreciate the input I thought about the pump since it only has a screen and no fuel filter plus it's old but yeah thank you guys for your help

[MORSNO]

Let us know what it ends up being so we can all learn, thank you.