I've got a supercharged VX. I've got a check engine light and the idle is high or stumbles, with the car dying out at low speeds or idle. The codes indicate bank 1 and 2 lean. P0171 and P0174 are the codes it keeps throwing. I think the intake gaskets need replacing. Am I on the right track? Anything else I could be missing? Also, how much should the bolts for the intake manifold with supercharger be tightened? Should I stick to Isuzu's 13 lbs of torque? Any tips in for removing the manifold to replace the gaskets?

Any help/ ideas appreciated.