[docooh53]

Currently have a 5 yr old craftsman leaf blower......recently, the blower is very hard to start & won't idle. I replaced the spark plug, fresh gas, air filter, gas filter and line. Still experiencing the same issues.....

[leroys1000]

There should be a low speed and high speed adjustment screw
on the carbuerator.
If you can't get it to run by adjusting those,then the reed in the carbuerator
is probably worn out and the carb will need a rebuild.
The reed is usually a part of the gasket inside the carb.
The low speed screw should be adjusted for smooth idle and the high
speed screw should be adjusted while running full speed.
It should be adjusted until it is running smoothly at highest speed,then
backed off til it starts to flutter a bit.
You don't want it running out full speed as it will burn up and seize.
The flutter is caused by the reed vibrating to control the speed.

[mtzlplex]

The last time I had a small engine exhibit the types of problems yours is, I picked up a small bottle of Sta-Bil fuel stabilizer at Walmart, and added small amounts to the gas tank of the engine every time I would fill it up. Sta-Bil will help gum/varnish from forming on the internal engine parts, and help keep it from returning(safe to use on all engines). Now, that being said, it may help your engine start, and run smoother, and it may not, but that would be a place to start. I know in my case, it helped my engine start, and run smoother. But if you have a worn part, then that would need to be replaced, or rebuilt.