DTC p1520 and p1537

[96 Z-Ragtop]

Hey guys,

I am about to put a bullet in this truck. I have replaced just about everything there is to replace to get rid of these codes and they still pop up and the truck runs lean. Any body have a clue what I can do to get rid of this issue?

 

[Hooligan]

Do this first http://www.rangerforum.net/f4/please-create-signature-718/

 

[Brinker88]

90% sure its your UPPER intake manifold gasket

 

[96 Z-Ragtop]

So far I have installed a brand new intake manifold w/gasket, new 02 sensor, new mass air sensor, new coolant temp sensor, and just about everything else on the engine.

 

[Brinker88]

EGR valve?