@BostonJeremy77 mentioned the Flight Director was not pushed. I have looked and looked and cannot locate it.
Perhaps that one button is what I am looking for. I have watched You tube videos of people using the auto pilot and it working, thus my frustration
I did redo the sensitivities on the joystick. Here is what happens-I reach 1,000 ft, I click on the ALT button, according to the 2 page PDF for the autopilot, the altitude is suppose to hold at the point when I clicked it. For me, it’s at 1000 AGL, I let go of the handle, and the AC will climb to 2,000/min, then it will go down to 2,000/min and keep repeating. I did trim the elevator and that helped.
I have setup dozens of flight plans and flown them before using different AC (C172 with the G1000), this is some what new (I feel I’ve used this AP in FSX) yet, I am missing one part.
OK. I just did a test. Everything worked fine.
Follow this procedure…
ON THE GROUND: Enable VS mode on autopilot control. Using the wheel, set it to +8. Enable NAV, make sure CDI is on GPS. Trim the aircraft for takeoff, rotate at about 70 knots, retract gear on positive climb rate. Retract flaps around 300 feet above ground. The press the AP Master button to activate AP. It should climb stable at 800 feet/minute. Put the Prop Lever at 91 or 92% to get to 2500 RPM. When you reach altitude, press ALT and it should hold it. You will have TRIM and ALT anunciators lit up.
Thx @BostonJeremy77
I also found out what MY problem was as well 
I was looking over my keyboard commands for FSX and noticed, “Z” to toggle the auto pilot. So, while in the air, that is what I did. Even though the autopilot switch was on, toggling it with the Z key turned it on (for sure) and I am now flying my favorite routes through Jax, FL. the altitude hold works, in fact, I was a touch short so using the VS I got it where I wanted to be.
I will also follow your suggestions as well
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I toggle it on my Thrustmaster, or by simply hitting the AP Master key with the mouse in the cockpit. Good luck. I usually set VS on the ground… that way I am not tinkering with it in the air and once I enable AP, off it goes climbing.
New problem
When using the altitude hold while it is sunny outside, clear skies all around, I can stay at my selected altitude.
However, I flew in NYC today, it was cloudy, lightning, and my altitude kept changing. Not by much, but around 400/ft
I suspect I know the answer, but would like confirmation
. I suspect its this item that has the 0212 being displayed.
That’s the transponder squawk code.
I’d suspect that if you’re flying in weather, you’re getting turbulence related to that weather.
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That or your barometric pressure changed a bunch.
I was thinking of that, and I routinely use the “B” key while flying to keep it accurate (cant think of the right way to say that, lol)
Hi,
I have another “problem” with AP in the Carenado P28R.
After takeoff I usually press AP master to mantain climb rate. But (after SU4) it stops to climb and it enters directly in TRIM/ALT mode.
Does the same thing happen to anyone?
PA28 autopilot does not enter any mode by itself. Before you enable AP, you should set VS mode and dial in the vertical speed. You should have the annunciator illuminated for it. Then when you reach your desired altitude, activate ALT mode.
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OK. I will try this evening.
Thank you 
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