First off the problem is no longer just poulan. I am seeing it on earthquake tillers, MTD trimmers and blower, Southland trimmers, Remington trimmers. They are coming from the factory with the carb set to meet emissions, but they are too lean to run correctly. Won't idle unless you turn the idle screw in all the way. Won't rev up properly. I probably adjust over 200 carbs a year within the various brands, and see about 10 a week that are too late to adjust.
Poulan warranty use to be, "we don't care what it cost to fix, just fix it." Now the policy is "if the cost of repair will exceed 50% of the unit cost call us and we will send a replacement unit." I had a guy with a Poulan pole trimmer this year that they replaced with a Husqvarna unit.