Hai.. im e90 320i user..my car 2007..when i start the engine..symbol P N at meter cluster blinking..anf at gear lever got knocking sound at idling...when i drive suddenly came out Gear logo with red colour..Anybody help me..why its happen like that.and lock at 3..if i accelerate to much engine will jerking seem like engine want to die..anybody help n info me...please.