My ryobi will start but dies about 5 minutes later

The replacement carbs are cheap and I would go that route after all the work you have done for nada.

this sounds strangely like the high speed jet/pathway in the carb is clogged up with something ,

the best way to fix it is dissasmbly and cleaning of carb in solvent , but ive also had some limited sucess in past of using car fuel cleaner (says on bottle "cleans as you drive") too

Sounds like it is slightly out of time.

make sure that the vent to the fuel tank is working

this sounds like a carb problem one that needs porfessional help take it to your small engine shop be careful as to not go over the valvue of the blower on repair and parts have them to give you a quote first

remove dog house locate test port and install guage should be 45-60 psi

Sorry but I have the same problem, did everything you did plus bought a new carb. I think these are just a bunch a ****. I have Ryobi electric tools which are okay but I am NEVER going to buy a buy Ryobi gas product again>

carb is bad rebuild carb

could be the coil

well take the spark plug out take some WD40 and give it a shot inside the unit, remember to keep the unit level when hitting the throttle and allowing it to warm up for a few minutes before use also make sure where your choke lever is. also when starting I start it on the ground like most manuals state and leave it idle on the ground for a minute before picking it up and then when I pick it up I make sure that the gas tank is tilted towards the ground so there is no room for air to get into the filter causing and disturbance while the unit is warming up.