Missfire Under Light Load

[MBS206]

ok, done some more investigating and i found out that No 5 cylinder is not firing sometimes ( pulled coil plug and noise didn't change), swapped coils and still not firing on 5. listened to injector a can here it clicking away so that is ok. now swinging towards maybe a sticky valve. don't think it would be burnt as comes good then crap again.

I'd be looking at the harness or ignitor.

You just said you pulled the coil plug off and it didn't change anything. I'd be looking right there at the spark.

Pull the plug out, shove it in the coil pack, hold it against the head and see if it really sparks.