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That TV uses the RCA synchroguide horiz circuit with two two coils. One is the customer accessible horizontal hold control. The other is a service adjustment designated L108 on the RCA schematic. A quick adjustment would be to get the horiz as close as possible and adjust L108 to fix the "motorboating". Then re-adjust the hold control for lock in. It will only take a 1/2 turn in either direction to fix it.
There is a detailed horizontal alignment procedure using a scope if you are a purist, but if you adjust L108 for max 3 bars top left to lower right before motorboating, it will come out the same.
If trouble persists, the 330 uuf grid coupling should be replaced with a new silver mica.
Don
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