well i came back for a work trip being gone for a week i get in start my blazer and it felt sluggish then started cuting out check engine light came on and threw all these

p0122
p0405
p0452
p0404

i looked them all up but any reason why they all came on at once

 

Try tapping the part of the egr that is attached with two bolts to motor with socket extension and hammer/remove egr and clean. Replace gasket with screened up-grade. Use di-electric grease on five pin connector. Sticky egr. Chunck O' carbon got tossed.

 

well just changed tp sensor egr cleaned Evey sensor on top of motor and its still acting like its starving changing fuel filter now

 

All of those codes are electrical issues. I don't think the fuel filter will change anything. Double check all of the wiring, and the wires from the pcm.

Have you tried to unhook the battery for awhile to reset everything? It sounds like electrical gremlins to me.

 

Low battery voltage can cause lots of random CEL codes.

 

x2 on the battery try trickle charging it

 

Starving? Have you checked fuel pressure and leakdown?

 

defently not batts i have 7 of them in my truck and there 100 pounds each lol

it was the fuel filter guys i changed it and it didnt throw codes and runs good

 

Glad you got it figured out!

 

Very common that a new fuel filter clears up the problem, especially if the fuel pump is weak. A partially restricted fuel filter puts added stress on the pump, a new filter would allow a borderline pump to perform acceptably....for awhile Did you check pressure & leakdown?