Change the Oil and the Plugs... Try Mobil 5w-30 or 10w30 depending on where you are, Or Havoline... I would reccomend one or the other... They are my oils of choice... Also Please use an AC Delco PF47 Filter, If not an AC Oil Filter, Try the Puralator... Both good filters...
After using the seafoam you may have fouled the plugs as well, Go ahead and replace those as well.. Stock AC Delco, AC Delco Rapidfire 14 or NGKTR55'*... Even Autolite would be a good plug...
Do these items above and see if they help you at all... Good Luck and let us know what happens
And while you are at it, check that Modulator... Make sure there is no trans fluid in the Vacume line or the vacume port of the Throttle Body, Then check the Tran Modulator Vac port... If there is no fluid present than the modulator is still good..
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