[Shotimes] help with codes, please!

[Robert Bruce]

The good.... I recent acquired a 95 mtx with 189K miles.  I has no leaks, has been 100% dealer serviced its entire life by the
original owner.  Interior in like factory new too, even the driver's seat.  The car apparently has had a CE light for a while, so
the previous owner just parked it rather than sort out the problem.  Overall the car is in factory new condition.  The front license
plate holder is still in the trunk wrapped in a plastic bag.

The bad.... 
1) The heater/defroster blows only cold air.  My guess is a bad blend door motor.  Isn't that the most likely fault?

2) CE light - The engine has NO power.  Idles ok, but as soon as you touch the throttle, it lays down. Just acts like it's
completely choked on a way too rich mixture.  On the highway, once you finally get up to speed, it goes, but has no throttle
response. CE light comes and goes at random intervals throughout the range of speeds, idling, low loads, high loads.  I have a pile
of known good spare parts, but would like some advice before I start blindly throwing parts at it.  Please help!  TIA! 

KOEO codes 181 and 189
KOER codes 159 and 225
Cylinder balance test fails #2, 3, 4 & 6

Bob Bruce
92 w/ a mod or two
95 mtx 100% bone stock