Cusser
+1y
I'd check the choke adjustment, choke wiring, and idle mixture before I even thought of taking off the top of the new carburetor.
This kit WILL run smooth and trouble free. Did you retain your EGR valve as a shut off (I assume that it does close fully) or did you make a block-off? Double and triple check to make sure ALL of the vacuum ports on the intake manifold are capped (small piece of vacuum tubing and wooden golf tee) ?