I have a Husqvarna 455 rancher I have been trying to adjust the idle and carburetor but it's still running a little rough. Any Suggestions?

Most 2-cycle chain saws have 3 carburetor adjustments; idle speed, low RPM fuel/air mix and high RPM fuel/air mix. The fuel/air mix needle valves will probably require a "special" driver tool to adjust them. Be careful with the adjustments, you can really mess things up by incorrectly adjusting them, then your saw goes from running poorly to not at all.

You most likely have a fuel delivery issue. This could be anything from bad fuel lines, clogged fuel filter to a bad carburetor. Start with replacing the fuel lines. They most likely need replacing anyway. The fuel filter should also be replaced. Then if the problem is still around, you have carburetor issues. I don't recommend rebuilding, they are too cheap to rebuild. Buy a new one.

Try opening the choke half way as soon as it starts then all the way open in a few seconds... It only needs the choke to start and should run fine in less than a minute after idleing with the choke not engaged...

This sounds like the throttle spindle sticking, or the cable sticking, if you remove the top cover and air filter, then push the throttle spindlefully back to the stop screw with your finger, then try again, the spindle may be a little gummed up.

there are two adjustment screws on the carb that you can mess with it sounds like it is out of adjustment a little bit one should say hi the other lo try the high adjustment count the number of turns so it can go back where it was

Carb adjustmwnt requires a special tool and a tacho, the saw is set from the factory for the best emmisions, however it may need a small adjustment, this should be done by a qualified dealer, incorrect adjustments can damage the engine.

Sounds like the clutch is still grabing. Easy solution is to apply the chain brake at idle to stop the chain turning. Try adjusting the L screw for a smoother idle.

Start with "H" and "L" 1 turn CCW from lightly seated. Then tune for performance like this.
Carburetor Adjustment by Madsens.com
http://www.madsens1.com/saw%20carb%20tune.htm
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.
There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH
Lou

Here are a few things to consider :
- fresh fuel ratio 40:1
-new spark plug
-choke not sticking
-air fuel mixture correct
-bar and chain oil tank full, oil getting on chain
-bar sprocket in good shape getting lubed.
Please let me know what you find.

if its over a year old and you used other than 93 octane, you need to rebuild the c arb, i did an runs like new