The map reading of 87 KPA is high, as in higher than my ambient air pressure in Denver 83KPA. I'd suspect either the map sensor is bad or possibly not (or poorly) connected to the manifold. Idling I'd expect a map reading around 30-50 KPA roughly. The O2(1) voltage of ~.8V indicates rich mixture, probably caused by the faulty MAP reading. Assuming the MAP reading is correct I'd suspect a plugged catalyst is killing the manifold vacuum and hence power.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff