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The problem is most prevalent when running errands on a warm day. When the car sits for 10-15 minutes it runs rough on start-up until I give it a few revs, then it returns to a perfect smooth idle. Fuel pressure is set per Toyota specs. My only guess is the fuel pressure up (FPU) VSV has gone bad. I think its purpose is to alter fuel pressure for hot starts. Any other thoughts?
 
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