Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
Leakdown test. If you don't have a fancy leakdown test tool you can do the redneck test. Take a compression tester and take the valve out of the hose. Set the gauge aside, as you will not need it. Put the piston at TDC. Thread the hose into the spark plug hole, and hook up the compression tester hose to your air compressor and shoot some air into it. If air comes out the intake, intake valve. If it comes out of the exhaust, exhaust valve. If it comes out of the crankcase vent, rings or hole in piston. If a spring broke, it might have let the valve sag which might have hit a piston and bent it.
If it runs fine up until 3k, might be a lifter not building up hydraulic pressure.
It runs crappy up to 3k then it gets really crappy.
I just did cams and lifters on my 08 because I had some strange sounds (73k miles) coming from my cam chest... took care of the noise. If it's dying at 3k... I'm betting lifters.