EGR, relation to lean? Options

[6gcnoob]

guys i keep failing the emissions test. im good on everything but my NOx. Ive been told time and time again that its my EGR or cat.

i am running two cats one on the stock mani and one new one down below. i got fed emissions.

i am also throwning a CEL # 25, lean air/fuel ratio. does the EGR have any relation to this code. if my VSV or temp sensor for the EGR failed wouldnt i be throwing a code for the EGR. i applied vacuum to the valve itself and the engine stumbled and died like it should. i cleaned the injectors and filter too but im still getting the code and failing.

[6gcnoob]

well i know i have no carbon. i just put the motor in and started driving it not too long ago. pistons were clean when i put it in, took out my plugs the other day and shined a light down there and they are still clean as can be.

it drives fine, no knocks or pings. doesnt buck or stumble. drives like it should. im not too sure about my ign. timing. i dont have a timing light. i have retarded it a bit awhile ago to see if that could help me pass, but still no go. should i reset the ecm? warm it up, unfuse for 1 min, start it and run it for 10?