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Bad fuel. how do I flush out my system.

  • 1985
  • 928S
49 875
Fuel System
rock hill, 
South Carolina

After putting in 7 gal. of premium fuel the car started to loose power,run rough as I exited the station. running good before putting in the fuel. 2 blocks to the house.parked in garage. I had to leave for a scheduled vacation the next day. 8 weeks later I was able to siphon a gal of gas out. Gas looked good clear no dirt or water. car starts right up but runs very rough and no idle.Car had alot of maint. done to it  a year ago. including new fuel pump and filter. return line to tank replaced. rebuilt ecm,spark plugs, all belts replaced. car ran great till I put in the gas. thank You, Bob Johnson.

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