My Husqvarna leaf blower has been giving me trouble for at least 6 months.  Originally it was very hard to start and ran very rough and soon died.  I replaced the plug, air filter, hoses and tightened the loose fitting carb.  No luck.  Then replaced the carb with one from Husqvarna and checked for spark which was positive. Still ran bad and hard to start.  Finally replaced ignition coil and that seemed to do the trick.  It worked well for about 2 months but now it starts right up works for about 15 minutes then dies and won't restart for an hour or more.  Any help would be appreciated.

Check for spark when the issue occurs..
 
.

I'll give that a try
 

How to test ignition coil on leaf blowers? This is a very important step in diagnosing and solving ignition-related problems. The ignition coil plays a key role in creating the spark that ignites the air-fuel mixture in the engine, powering the blower.
If you suspect your leaf blower is experiencing problems such as difficulty starting, poor performance, or misfiring, it is essential to learn how to properly inspect the ignition coil.

How to test ignition coil on leaf blowers? This is a very important step in diagnosing and solving ignition-related problems. The ignition coil plays a key role in creating the spark that ignites the air-fuel mixture in the engine, powering the blower.
If you suspect your leaf blower is experiencing problems such as difficulty starting, poor performance, or misfiring, it is essential to learn how to properly inspect the ignition coil.