My roommate's granddad had a 2 year old Poulan Pro hand held blower that would not start with a new plug and fresh gas, so he gave it to us to tinker with. I took the plug out of the head and it had strong spark, the carb and fuel lines appeared clean, and the air filter was clean. It did seem a little weak when trying to start, but there was definitely some resistance; I didn't test it because I don't have a compression tester at home and I'm not buying one for a free Poulan. I took the engine cover off to check the exhaust when I noticed fresh gas/oil seeping from the head. Sure enough, the two head bolts were loose. I tightened them down and it started up on the second pull. Free working blower! It's not ready for the dumpster yet, but that sure is sorry [censored] quality.