92 chevy 350 x-cab jerky, rocking chair motion at 1200-1500

All help will be greatly appreciated....read a post by Mike D on 18 Mar, about chevy lumina with similar (to me) actions...could this be my problem also?,or do any of you have any thoughts. I thas good acceleration and runs smooth at higher rpm's, but from 1200-1500 when throttle is being floated, you'd think I was bouncing the brake pedal HELP!

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Torque converter slipping in and out of lockup?

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