2005 Nissan 3.5B has never run well. Low hours on the motor. Idles and starts great but when I give it gas it tends to stall. If I increase throttle very slowly it might not stall. Changed plug and purchased and installed an entire new carb. No change in performance. If I adjust what I believe is the idle speed screw on the side of the carb, I can raise the RPMs and the engine does not stall as often but shifts hard due to high RPMs. If I adjust the screw all the way in, the engine still runs which I am not sure if it is supposed to. Any other things I should check before giving up on the motor?
