[speedracing944]

Originally Posted by onZedge

Excellent suggestions so far. You don't have to have the intake off for these, but if you are eliminating all possible vacuum leak sources, I would replace the o-ring where the dipstick tube plugs into the block and the oil filler cap o-ring as well. Don't forget the brake booster hose.

While you have the intake off, check the big vacuum nipple on the bottom to make sure it is tight (it's a press fit). Someone here recently had a running problem that had some of us scratching our heads. The problem turned out that the big vacuum nipple pulled out of the intake manifold. Now that's a big vacuum leak.

That someone was me The nipples appeared to be epoxied in and the epoxy degrated. I have heard of a couple of others having the same trouble.

What I did to fix mine (and I would suggest others to do the same) is to cross drill a hole into the manifold and the nipple cross ways and use a tap to cut threads into the manifold. I then ran a bolt through the manifold and through the nipple. It shoudl never come out again.

BTW my car was down 1.5 months trying to solve this problem because of school and everything else going on.

Regards,
Speedy