Polaris troubleshooting have put new battery, new control modual, new fuel filter, now i have a boggin issue, will run at high rmps well, but at lower speeds, it bogs, and you have to feather the throttle to get it to rap out, wont hold a steady 20 mph?? any thoughts

Question edited for clarity, plus full make model (what it is).
Question moved to our only Polaris Trail Boss category.

That is a lot of stuff to change all in one go. One of those items has caused the issue in what was presumably a running ATV? Always best to swap out one item as a time and check everything runs as expected before moving onto the next, checking after each replacement.

The last sentence is confusing even with my edit. I take it you mean it turns over, it catches the odd time, but won't run. In that scenario, and with all the parts you changed, I would check the spark plug gap and that it has a good fat, blue spark. The other thing is the carburetor settings as per the service manual. Engines only need fuel, compression and a spark at the right time.

You might try to ask someone to help on the ATV web site below:

https://atvconnection.com/forums/polaris/330956-year-my-sportsman-400-4x4-1997-a.html

Hey Wayne... Does it run fine in forward? Try to eliminate anything that causes this issue in forward and reverse. Clean and set carb (by a professional).. New air filter. New spark plug.

and...
http://www.polaris.com/en-us/atv-ranger-rzr/owners-manual

check to make sure diaphragm in carb is good

If you are certain the spark plug(s) is in good condition and correctly gapped, and the magneto is working normally, then you may have a fuel system problem. A quick diagnosis of fuel system issues is to spray a shot of starter fluid or WD-40 into the intake through the throttle body. If the engine fires for a bit then quits, it's a fuel system issue. Small engines do not do well with old ethanol-containing fuel. If it's turned yellow, drain it out and replace it, and remove any in the carburetor float bowl also.

Air leaks in the carburetor or intake manifold gasket may also cause hard starting. A sticky carburetor float or float valve is another possibility, especially if the engine was sitting for a long time with ethanol fuel drying out in the float bowl. A dirty air filter will also cause starting issues.

if its EFI its an injector, it not fuel injected, its a carb issue

If you need further help, reach me via phone at https://www.6ya.com/expert/allen_b068623c5003aa4b

Faulty fuel filter.
Fuel filter installed backwards.
Bent fuel line.

Listen I have a 2009 EFI Polaris sportsman 500 it starts up goes fine down the road but sometimes it takes a fit an starts to bog out when it starts to do that all I do is shut the key off an back on real quick and it takes off again I'm really confused on what is making it do that because I changed the gas an air filter plus put a new spark plug in it also a new battery can anyone tell me what I could do to try an fix this problem it's got to be something easy because when it does that all I have to do is shut the key off an back on than it straightens up weird I know lol but please help me with some suggestions thanks