I bought this and it had been in a wreck. Replaced hood radiator, radiator support, Then I found a broken transmission support. I took many things out of the way on top of the motor to get at it. It had a cracked manifold absolute pressure sensor so I found a good used one and replaced it. It idled before all this. Now it won't idle. I need to back track now. What did I do? Any guesses. New to the ciub...

 

The MAP/T-MAP...
The cold side and hot side look EXACTLY ALIKE...but the specs are different...
The r53 hotside is not swappable with the cold side one...
I tried...result is stalls ...
I would start there...the hotside t-map...the one you have should have a different part # on it than the cold side one, which is the same as r50 units, and many Rover parts...
The hot sideunit for the r53 is usually a special order part...

 

That maybe it. What part #? The only electrical component I changed. This one is right behind the radiator support. Is the cold or hot side.

 

The one it needs is a 12140872679 and it's not the number I put in which is a 12140872848. Wrong part sent to me. Ordered so it will be a few days to verify.