[V8] A few issues with my '93 4.2

[Ingo Rautenberg]

OK, I would have quizzed the guys in Suffolk, but I didn't make it  
and so I didn't.

So here goes:

The darn thing won't downshift like my old '90 - even in sport mode.   
Idle switch functions properly. Also upshifts from floored in first  
a~ 5k in normal mode and ~5.4k in Sport mode.  Normal?  Can I switch  
Trans ECU with the one from my "project" '90?

I have and annoying low-toned whine that's coming from the fuel tank  
area and is intermittent while driving and almost always present  
after parking and shutting the car off.  Seems like some kind of  
relief valve?

TIA

Ingo
'84 urq - '91 V8 5 spd - '93 V8 - '90 V8 (project)