I use an Stihl 034av 23ish bar that's a really hard start. I have to use starting fluid when I haven't used it in months. Once its started it runs like a raped ape.
Sounds like what mine was doing when my TPS went bad. I just unplugged it and it worked fine. If unplugging it works, it needs to be adjusted or replaced.
We use them all the time at work with no issues. If you are worried put some blue locktight on the threads. Just don't get it on the sealing area. Or just get another 90* swivel hose end, like the one in the background of the second pic.