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Thanks very much for these suggestions. Would the head gasket problem appear suddenly, like this problem did? One second there are no issues, the next it is doing this cycling/surging? Now the problem is there even when the engine is cold.

Thanks for this suggestion. I'll investigate this. I'm not knowledgeable about fuel pumps. Would it make sense that the fuel pump would work at high throttle (when the problem seems to be absent) but not at low throttle/idle? Also, would it then just be coincidence that the one of the spark...

Hi, I'd appreciate any suggestions you might have for the following problem. About 15 minutes into the first cut of this spring, my mom's Husqvarna lawn tractor with KT725 engine suddenly started "cycling" like somebody was pushing the throttle back and forth about once per second (see video...