92 16v sidekick low power

[fixkick]

this MPI system
works like this
the MAF measures air flow, (mass) into the engine at all times.
the EFI takes that flow and then adds fuel (injection pulse widths) .
The 02 corrects any errors, from above, during idle or light cruise, but not acceleration or wide open throttle.

so vacuum leaks, cause lean. (02 off line)
a bad 02 can be stuck at 0volts. this causes, rich.
an exhaust leak near the 02, cause 0v. same ends.