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Can you help on codes p0172 and p0300 ,p0301 thur p0308

(1997 Lexus LS400)
in Dothan, AL on June 22, 2013
P0172 is the opp of p0171 scan datda after pulling efi fuse for 10 mins reseting fuel trim replaced all plugs ran good untill it warmed up, drained fuel refilled with fresh 93 oct, drove for 2 miles check engine light on fuel trime back at -35. power steering hard to turn, read on forum that the vacum valve may be the cause or bad caps in ecu. Thank you . fire is good on all 8, plugs foul fast no sign of coolant leaking.
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