I have '98 VW JETTA Wolfsburg and EVERY time after hard rain (cold OR warm weather), the next day my car is unable to start without giving it gas while turning the key. It only starts after a few tries AND it “bucks” when I give it a bit of the gas pedal early on (within 5-10 minutes) into the drive. After that time, it drives great like always. Just had the fuel system “cleaned” at a local oil change conglomerate, which yielded tons of white smoke out of the tailpipe. Any thoughts?