long story short car has been sitting in my garage for 3+ years. Before I stopped driving it the turbonetics t3/t4 went and I bought a precision sc44. The 44 was to big to fit with the drag mani so I bought a G35c to drive to work. Over the last year I have been putting the car back together now that it is done I am having a issue with the car running really lean and hesitating (according to the A/F meter). I thought it was because the tuning was way off because of the new mani and turbo. so i took off the charge pipe to the intercooler but its still the same. so far I have changed the plugs,wires,cap,and pcv valve. Today i will change the fuel filter is there anything else that can cause this that I am missing I am not an expert by any means but I am not sure what to do..here are the specs on the car

99 em1, 109,xxx
b16a2 golden eagle sleeves,weisco pistons,eagle rods 40k on build
stock head
sc44 turbo
ramhorn mani
rc550 injectors
stock rail
walbro 255
hondata s200 w/boost
stock cap and the original distributer

One thing I forgot to mention is if I start the car and run it there are no problems. It seems to start happening about five minutes into driving even if i dont boost it. thanks guys