i have a pos ZC swap in my CRX and it has a CX exhuast manifold(have to wait to get an SIone) at idle my car is fine.. then when i give it a little throttle it starts to missfire running on 3 cylinders (the motor torques heavily)
the gas that is in it has beeen sitting there a couple years.... could this be the problem? could the manifold be causing too much back pressure?

i tried to drain the gas but then the damn screw is too tight so i cant take out a fuel line and no luck with syphening here... i dont have a pump

 

BAd gas could definitely be the problem. I would recommend draining, even if you have to take the fuel line off the fuel rail and turn the key on.(dangerous)