"BlueJean" my 4 speed '90 MV with 146,046 miles and stock 2.1 in her, 
keeps running lean at around 2500 rpm in neutral or on the highway.  The engine will
"jerk" quite noticeably until I mash the accelerator or push the clutch 
in (when going down the road).  The following test's/possible solutions 
have been done by my very competent but stumped mechanic:
Compression test  - 135 - 155.
Coil/spark plug resistance test.
Fuel pressure test at test tab - idle - 32. under load - 36.
ECM pin out scope for:  Collant temp; Air flow; Injector output; Air intake;
O2 sensor voltage; Emission input and Idle switch test.
Swapped ECM and Air Flow Meter for known good.
Sealed exhaust leak.
Replaced all grounds for ECM on left cyl head and under ignition coil.
Swapped Digifant control relay with fuel pump relay.
Drained fuel and found 10% alcohol in fuel.

Any thoughts for solutions would be REALLY appreciated...
 
Thanks,
John Kulina