I think you did something when you pulled the intake..You should go over your work and consider pulling the intake again.

How did you deal with fuel rail on the orig intake pull? Did you unclip the long elec harness at each injector or did you pull rail and harness together.. you might pull elec connector and see if pins are bent and/or if it is fully seated at injector 1..

Any chance the intake gasket is folded over at the front? Did you replace the gasket?