Okay, I'm back. Still have issues. 1990 740 Regina. Pretty sure I need to check my MAP sensor but I can't find it!

I found a huge problem with the car that was NOT helping diagnosis - the exhaust had separated right after the 02 sensor, causing it to read open atmosphere whenever the car wasn't moving. Put the pipes back together (the nuts had backed off of the studs holding it together) and it runs a good bit smoother now. And with a muffler and a real exhaust in the system it's a heck of a lot quieter. (And I made sure my cat isn't clogged.)

It's still a bit touchy, though, and has really intermittent symptoms. Sometimes it runs like it's extremely rich - idles at ~300 rpm and just doesn't want to cooperate unless I floor it. Other times, if I give it any throttle beyond the barest feathering, it'll try to stall. Still other times it runs almost like it used to.

And of course if I hook up my idle circuit it starts hunting wildly and occasionally stalls for no reason.

Having finished my finals and obtained some free time from work, I'm ready to get this car running right again. So I'm looking into the MAP sensor now.

Can't find it. Found a thread that suggested it would be on the driver's strut tower but I don't see anything that looks like it might be what I need. I've looked on fcpgroton and ipd trying to find a picture of it, but no dice.

It seems, from several people's reasonings, that this sensor is likely to be at fault for my problems. I just can't figure out where it is. I've tried following vacuum lines too, and haven't found it.

As always, help appreciated greatly. I just need a picture or a diagram or something. I can't get my bookmarked green books page to load right now, either.