Q: pick up low & starting problem in morning time.

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I have audi Q7 3.0L v6, this is my dream car, last week saturday i came back at home after long drive{385KM} still saturday night my car was ok but next morning my car had a long self and too much white smoke from silencer but no i did not see any warning light on instrument panel and i drove car after 5 minute idling. when i drove my car i feel car did shift gear properly for checking i pressed full accelerator then i feel engine knocking sound and i stopped car after switch off engine i start car but still engine got long self and engine misfiring suddenly glow plug light on in cluster. Then i came back at home. i have car scanner, so i was check with tester i found code p8700 fuel pressure to low. please suggest me for next step.

My car has 68900 miles.
My car has an automatic transmission.

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