Aomeone please help
I have 02 sierra 6.0 and having nothing but problems. Something keeps getting worse and no clue what it is. Ive takin it in to a dealer and they looked and drove and say it runs awesome.
To the problems
1. doesnt shift like it use to think its a sticky valve
2 My efi box for the whipple keeps flashin the 24 code which is the mass air flow sensor which I'm on my second box. which comes and go when it wants
3.big Loss of power and i keep losing more and then it comes out of it.
4. It keeps saying my 02 sensors are faulty every once in a while and i just put new ones in
Please can anyone help

sounds like a wiring problem, check all the splices from the whipple box and make sure they are all soldered good and hooked up correctly.

checked all wiring all is good
now it is throwing up 2 codes po131 and po151 which is o2 sensors which i replaced its like someone is holding the brakes when i give it gas

do you have access to a scanner to watch the engine data in real time? those codes can be from a lean condition which would explain the power loss. check the fuel pressure and the MAF sensor.

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01' Silverado
www.fquick.com/454SuperSport