We're pretty sure there is no vacuum leaks. 2 days in a row, every start up and would idle crazy and I thought it be easier to fix. Well, now it's back to normal mostly... however, when you rev is in park up to like 1500 rpms, it has a bit of lag coming down when you remove your foot from the pedal, it stops for second about 1200 then 1000 then drop to about 750.

Additionally, I heard you could test the MAP sensor by unplugging it and it goes into limp mode, but not sure what i'm looking for, so i started it up after unplugging it and it seemed the same, so i plugged it back in (w/ the car off) and then removed fuse 1 and put it back in to clear check engine caused by unplugging the MAP sensor. Next, we started it back up with everything plugged in and i've driven it 16 or so miles since and hasn't had a problem. Can you tell anything from that?

Am I suppose to drive w/ it unplugged vs plugged in to test it or how.
What symptoms of which mode am I looking out for?

One last thing, is there just one Radio suppression relay? [http://www.fcpgroton.com/product-exec/product_id/16757/nm/1988_1992_Volvo_740_8_Valve_Relay_Radio_Noise_Suppression_and_Cooling_Fan/category_id/172]

All my testing has been at night (cooler) no problems, I do face all the trouble when it does occur in the day. However, the very 1st time stalled, but didn't do it again for a month was on cool rainy evening, so I don't know.