04 330 sputtering when accelerating
I purchased a 2004 330ci a few weeks back. The vehicle has about 22K miles, and was garage kept. After about a week of some-what aggresive driving, the check engine light went on just after downshifting into 4th gear at about 80 miles per hour to make a pass. The RPMS were somewhere around 3.5k - 4k. At the exact time the car began to sputter. The sputerring went away once the RPMS were over 4k. The vehicle had 94 octane in it as well.
I took the car to BMW for a diagnostic check. They said I have a valve gasket leak and #3 coil had oil on it. #3 was misfiring. I had a BMW certified mechanic (My Dad's friend) fix the gasket. That evening I was on the highway and tested it out. The Check engine light came back on, and the car sputtered again. The sputtering is very obvious when I was using the cruise control to accelerate. Maybe the slower rate of acceleration amplified the sputtering.
I called the Mechanic today and he said it might be that one of the coils have an issue because of being drenched in oil for God knows how long.
Any thoughts on this? I appreciate the help!