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Hi All (Help)

My 2004 TB po300 code, idle on start up rough, no vacume leakes. hiway 2500 + rpms 70 mph
Runs fine, no mises, no rough acceleration or rough deacceleration, get off freeway get to driveway, let idle 3 min.
Goes back to rough idle
Service light goes from flashing at ldle to solid at freeway speed
No other codes, ran Heet in tank and sea foam in brake power booster to intake.
Battery new and tight, cleaned the tb
Inline 6 , two wheel drive 135k
 
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