00 E430 4matic,
got the gas filled by the local lukoil for the first time ever. about 50 miles later the low gas light started flashing and check engine light came on.
Figured it was the gas cap, so bought one from the dealer and replaced. Still same thing.
When I come to a stop after driving a while, there's hesitation at idle and a bit of shake in the engine (rough idle) and that's when the low gas light starts to flash again.
Light goes off when i stop the car and restart but comes again after a little bit.
Changed the gas cap again from the dealer thinking it was a bad new cap. no use.
what should I try next other going to the dealer and getting it done there....
thanks in advance

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