On May 3, 11:21*am, "Nelly Wensdow" wrote:
I have a 15-year-old Sears 4hp mower that I change the air filter, plug &
oil each spring. It started & ran fine last week for the first mowing, but
now it acts like it's running out of gas. Runs full fast then slows way
down, back up again, etc. *What could be causing this? TIA

Could be the govenor is sticking if it happens within a few seconds,
its probably air vane , check linkage to see if you can move it and
free it up moving it back and forth.