ka-t need help runing lean!!!

[chuki monsta s13]

Hello everybody i have a ka24de with a t25, walbro 255l pump, n60 maf, 370cc injectors, smic, xs manifold, sr downpipe and elbow, Enthalpy ECU for 91 octane and stock FPR

NOw we retarted 15 deg BTDC, when we start the car it idles fairly high, i read the wideband gauge it reads crazy lean. We checked for vacume and boost leaks but none, we noticed when we spray starter fluid in the MAF the car idles perfect for a lil bit then goes lean. I am stumped any wise words would help.

thanks