I have a 2006 Merc 90 4 stroke on my boat. it is sluggish on acelleration.can i use a fuel addative for this ?

Question

since it is a 4 stroke I figure I can put something in but don"t want to risk damage.

Answer 1

Mercury recomends that you use no additives, except stabilizer for prolonged periods of inactivity.  This motor should still be under warranty, take it to a dealer for diagnosis.

Answer 2

You can a fuel additive to any four stroke engine. Just follow the directions on the package.

Answer 3

look at plugs first