I had a frequent cycling problem and the issue was that the air conditioning A-frame in my furnace was plugged.. it was causing a constriction that caused the n

I had a frequent cycling problem and the issue was that the air conditioning A-frame in my furnace was plugged.. it was causing a constriction that caused the natural gas furnace to overheat when it went into the second stage and cycle. (I thought it was a shortage of return but once I eliminated that I cut open the furnace and found the problem)