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Hi, welcome to Just Answer. I'm Ron and I will be helping you today.
You may have a fuel pressure regulator leaking causing it to be very rich at that time interval, just enough time to leak all down.
Then when you do what you said, you're equalizing the pressure allowing it to start easier. Another part called a purge valve in the EVAP system will do the same exact thing. Either problem is not an expensive fix, under $100.00.
Hi, I'm just following up with you to see if you have any more questions.Thanks, Ron
That may be true, so please remember to rate me 5 stars for my time.