Since I have had my trimmer (purchased used), it takes about 20-30 seconds to start and 20-30 seconds to warm up. My homelite blower starts on first pull but takes about 20-30 seconds of throttle useage to warm up also. Someone then let me borrow a semi brand new echo backpack blower. I filled it with gas and I have tons of trouble starting it, has to warm up like the others, and randomly shuts off in the middle of use. I have come to the conclusion that is could be my gas mixture. what brand do yall buy? every had problems like this?