1998 SL500 Check Engine Light
 

I just purchased a 1998 SL500 less than a week ago.
Today, after a few days of nice performance, the check engine light came on.
I went to AutoZone and a scanner found the following codes:
P0308 - misfire in cylinder number 8
P0455 - Fuel vapor leak
p1519 - Adjustable camshaft timing solenoid
The guy there thought it may be a vacuum leak based on the 3 codes.
I drove home and had intermittent misfire, sometimes running strong and sometimes sputtering. I got fuel system cleaner and filled up with Shell 93 octane. Still had intermittent sputtering after filling up.
Just before it started missing I accelerated hard up to about 45-50 and then slowed and pulled into a driveway. I was parked for about 20 minutes. I noticed the check engine light within a minute of driving.
Any help would be greatly appreciated.