Volvo Repair: map sensor connection, vacuum tower, volvo 850 r

Question
Hi, I have a problem. The Car is a  Volvo 850 R Turbo Wagon, Auto Air 102,000 Miles. While driving our car the rpm started going up and down, so we stopped at a shop.
They said the throttle body was dirty and needed to be removed so, we did that.
We waited a couple of hours for the car and started home. The car ran a little rough, stopped at a signal the car died and the check engine light came on.
Stopped at another shop (shop/service station)
and they said the air pump was dirty. Removed and cleaned that. The car still ran poor but, we had to get home.
Took to a shop once home and the code was bad map sensor 121 and bad temp sensor. Replaced both sensors plus, the thermostat.
Had the radiator flushed
the car still will not idle smells rich? Like gas and will stumble and die out.
When the car is warm it will idle most of the time but will stumble and sometimes die out.
The code still states a bad MAP sensor code 121!!!
The code has been reset (many times) and comes right back.

Here is a list of all we have done to repair fix the car any help or suggestions would be appreciated as we have spent $1500.00 and it is not fixed!
Thanks in advanced for your time to look at this

Cleaned throttle body (removed)
Cleaned the EGR valve (removed)
Cleaned the Idle sensor (removed)
Sealed the Vacuum Leak in Vacuum tower (removed and siliconed)
Replaced the Vacuum hoses
New MAP sensor
New Thermostat
New Thermostat Sensor
New Fuel filter
New hose clamps
New plug wires
New cap
New rotor
New spark plugs
New air filter & box cleaned (no blockage)
New gasket throttle body
Cleaned all connections (electric)
Dielectric grease on all connectors

Also to let you know a mechanic told me that there is only one "hot" wire going to the map sensor
I looked and there are 4 wires total going to the map sensor and only one has power even when the car is running.


Answer
From what you've told me most possibilities have been elminated unless one of the repairs was done incorrectly.  It sounds like there is probably a wiring fault between the MAP and the computer.  That problem is a little hard to diagnose via email though.  I would look at taking it to your dealer.  Not just any shop but the dealer.  Volvo wiring diagrams are very hard to understand unless you've been educated as to what is what.  There is a whole week dealer training course for wiring diagrams for volvos.  You'd be suprised too with the price.  Most dealers labor rates aren't much higher than independents and it saves you the hassles that you've already gone through.  You also have Volvo tech line at the dealers where the tech can call the manufacturer and talk to the designing engineer to help diagnose the problem.  They have a commitment to fix it right the first time.  If its not right after they give it back, the follow up visit would be free unless there was a DIFFERENT failure.  Hope that helps.

James