aode08

If you pull your upper plenum, on the driver side front, there is a plug there, you might see an oily film around it underneath.

Simply get a hex key socket, remove this plug, apply thread sealant, reinstall and the intake leak is gone.
Found this on our 1993 Cobra with unstable Idle.

mjr46

no vaccum leaks are ever hidden from me.....I use a smoke machine

Richter12x2

Neat idea - is it a factory tool or something you made up yourself?

mjr46

no I didn't make it myself[:-]...companies sell them and ours was purchased through Snap-on tools... they are made expecially for looking for leaks like vaccum and or evap leaks but I tell you what...in less then 2 minutes I know if there is a vaccum leak and where

Richter12x2

I'm going to have to find me one of them. It seems like the better part of my life is wasted tracking down vacuum leaks, and they make such a huge difference in getting all my older cars running right.

mjr46

ummmm they can be quite costly...ours cost 1100.00 but I'm sure there are some cheaper versions not sure how much cheaper

Richter12x2

Gotcha - I may have to come up with something on my own then, or go back to the old carb spray method.

aode08

watch your knuckles

aode08

also if oil comes out with when you take the plug out, check your pcv valve and baffle screen