just curious, i dont think ive seen this mentioned anywhere else, was using seafoam in the VX today to help cure an idle issue ive been having (when coming to a stop the vx tends to stutter, rpms drop momentarily then come back)

i noticed under the engine cover just above the fuel rail on both sides there are carbon buildups at that joint that look like they are coming from inside the engine.. but i dont have surging idle or most of the other symptoms, just that momentary drop in RPMs

i should probably take some photos but has anyone seen these buildups before?

it makes sense that it would the the intake manifold gaskets since to my knowledge they have never been replaced and im at 83k miles