For the most part my van seemed to be running fairly stable. It wold stubmel a little now and then on take off but not often. Fairly often you wold feel a slight surging at very very low speeds just putting along. Other then that was the lousy gas mileage and black tail pipe..

When i removed the upper intake today I found the gasket had been torn during instillation, perhaps from the factory. I know it was leaking between the front two ports and perhaps sucking in fresh air in one spot in the same area. I think who ever installed it must have bumped the gasket when installing it. I am going to make a couple of line up temporary studs so it has to be sat down straight along with holding the gasket in place.

Here is what I found. besides the intake was black and wet looking like oil.

 

Yea, you had a vacuum leak there. Really though with port injection, there's nothing damaging about it, other than it could suck in dust if you drove regularly in dusty conditions.

 

I do know that on my older vette it ran like crap and it has a tuned port injection.

 

Yea, the engine's taking in a bit more air than the computer's adding fuel for.

 

Generally, an intake leak will cause a high idle.

When you re-install, try this stuff for attaching the gaskets, one can goes along ways - you will not have to deal with line-up-studs.

 

It's not a huge deal as long as the vacuum leak is within the limits of the PCM to compensate. The fuel/air mixture is adjusted in real time using feedback from the oxygen sensors, so the additional air would be adjusted for. There's a certain point where a check engine light would be set, but I think the older OBDI systems aren't as sensitive as more modern ones are.

If the van ran fine, I don't think there would have been any negative detriments beyond a small amount of unfiltered air being sucked through there.

 

on my chevy it was a leak between the runners and it ran friggin horrible