The "Bucking Bronco" mention...... If it feels like you're hitting a submerged object every so often, the engine is jumping out of and back into gear, indicating possibly a misadjusted shift cable. If so, adjust as follows:

If this is not the case, you'll need to go into detail as to exactly how the engine is acting.

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(Centering Shift Cable)
(J. Reeves)

When all is as it should be, the proper method to adjust the shift cable is to disconnect the cable from the engine. Move the shift linkage on the engine to find the center of the play in neutral, and when found, leave it centered.

Now, grab the end of the shift cable sleeve, push and pull it to find the center of the play there, and center that play.

Adjust the trunion on the threaded portion of the shift cable so that the centered play of the cable lines up with the centered play of the engine's shift linkage. Install and lock the shift cable with the retaining clamp in that position. That's it.

when I hit about 10 mph the motor stalls, runs, stalls, runs continually in about 3 second intervals. Just like if the choke was being applied.