Many pod filters block direct air flow into the air jets, because the step in the rubber boot is too tall. This causes irregular fuel mix entering the air flow from the main and pilot jets, because there is not enough bubbling above the jets. There are a few with a smaller step from the sealing surface to the inner wall, so some do work.
Now, running with the pods off and the CV pistons not rising is a different problem. Either the rpm don't rise enough to increase the airflow enough to lift the pistons, or you have some other blockage in the air passages, or just sticking pistons.