You say it starts at WOT and then when you pull the throttle trigger the butterfly closes completely and it dies??
You may know this about your Poulan but just a hint anyway:
Also keep in mind that since you found it in the trash a Bubba may have installed some wrong linkages or parts associated with the throttle or choke.
The choke when pulled to on also sets a throttle high idle for cold or hot start and when the throttle is triggered the
choke's high idle throttle setting is released to normal idle and usually on a Poulan the choke automatically goes to off, but on some saws the choke has to be manually pushed to completely off MANUALLY and the saw stays at the faster idle until the trigger is operated to unlatch/release the higher idle. Normal operating idle is set with the idle adjust screw, BUT the choke high idle is fixed on some and adjustable on a few saws. You can observe all of this without the saw running by watching the THROTTLE LINKAGE as the choke knob is operated and then the throttle trigger pulled to see the release. If we had the
EXACT model of your Poulan we can give you more precise/detailed info about the choke/throttle linkages
Also on some Poulans to start the saw at fast idle W/O a choke, you pull the choke to full on then push the choke knob back in to off and this leaves the throttle at a fast setting until the trigger is pulled to release the fast throttle setting. .
Also get yourself one or two of these 556418 Oregon chain/bar gauges @ about $5 from flea bay.
They are fast for checking chain pitch/gauge, file sizes, bar groove width. It's plastic but not easily broken and fast to ID chains, BUT the 3/8 Low Pro (LP) also called Picco will check the same pitch as a regular 3/8 chain on a gauge. The difference is in the drive link shape/size. If not really familiar with LP and 3/8 keep a piece of both close to the gauge and you can see the difference in the drive links until you get familiar with seeing them.
Here is a link to view the Oregon gauge on flea bay
:
https://www.ebay.com/itm/384186058345?hash=item5973460669:g:H0IAAOSwLtZgrTv3