Hi all, new to the forum and all searches have come up nil on this particlar problem. I have a Husqvarna Pro15 rider with the FH451V engine. At full throttle, the engine seems to run well, but when it is idled down, it surges as if it's starving for fuel. I changed the filter, no help. I have a suspicion that the pump is at fault. Do these pumps usually go bad slowly, as in only exhibiting problems at low RPMs when the vacuum is low, or should I be looking elsewhere? Any help would be appreciated before I just go out and buy a new pump. THanks- Great forum, lots of good info!