Hi,

I’m a 240 man but the engines is a red block and most of a 240 is still in the 900.
I use starting fluid sprayed directly into the intake manifold via the vacuum line off the fuel pressure regulator.
Using this stuff will confirm spark and timing is working.
The engine should run for a second or two until it burns off all of the vapors.
This way you know everything else “mechanical” is working and its not getting fuel.
The reason not, takes more digging.

If you have a dependable spark the CPS is at least talking to the ICU.

The Crank Position Sensor starts the whole combustion management system as it tells everything connected that the engine is turning over.
With two computers, the ICU speaks to the ECU to turn on a relay, or other relays, to power up the pumps., injectors and the air flow sensor to meter fuel.
The latest cars in the mid eighties on got a relay with the two inside in a combined package.
There could be that One side might be failing, due to bad soldering on the internal circuit board.

On my 240’s there is a check point to find out if the AMM and the injectors are being powered up.
It’s an orange wire on them. No idea what’s used on the 900’s.

More posters will be coming to help, if you can stay on top of providing history or other facts.

Phil