Originally Posted by
jonathand16y8
In addition, no one seems to have replaced their spark plugs and coils because it is expensive.
-I'm going to replace both the spark plugs and the coils to see if this fixes my idle problem and the slight hesitation between gears. The reason I'm doing this is because my car has 78K miles (close to 100K) and I keep hearing that coils on MB motors are a common malfunction. So well see what happens.
Why not take the plugs out, clean them, check the gap then make sure the wires are seated well before going to any expense? The plugs and wires aren't cheap and the coils less so. While your at it, like has been suggested, check and recheck the hoses.