In CIS the injector is just a fancy mister nozzle. The fuel is metered by the fuel distributor, continuously. The system already has a deceleration fuel cut, over about 20-25 mph with the throttle closed. The electronic control of the fuel distributor handles decel fuel cut as well as enrichment. I don't have specific flow rates, but the 3.0 CIS fuel distributor can flow enough fuel for +-300 HP. Takes a lot more air than the stock engine can flow to max it out. 9lbs of boost gets pretty close though.

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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