total miles on the motor?
Sorry if I missed it. Just another clue.
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also, is it getting worse?
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About 34,000 and yes a little worse.

 

when mine starting acting up this year with 12 or 13k on it,i tried everything you have,no luck called a dealer and was adv'd to run ethanol cleaner thru it and change fuel filter....fixed mine.....

 

I would think the Seafoam would have cleaned your injectors. Have you checked your front cylinder plug wire? Heard some problems with the insulation rubbing up against the tank and shorting out the spark.

 

I did check wires both front and back to be safe.

 

Checked with dealer. No calibration on tps for 07 ultra