1988 Chevy S-10 explain in detail please computer ground

I just noticed that?
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the( ECM /PCM /Computer )job is to ground the injector and its a circuit board
and not a serviceable unit
check the TPS volts

Yes TPS is the throttle position sensor
see if its volts high then the computer will shut down the injector
this is what was called a flood mode

Im sure you know this, but just in case there are two blk/white system ground wires coming out of the computer at pinouts A12 and D1. This is the only grounds you can check.

TPS volts should be under 1 volts
and as u step on the gas the volts should start to increase
if it volts high at idle disconnect the TPS and try it, crank, check if u get injector pulse
and if u have it then I would say replace the TPS
good luck

When key on
you should have a battery volts at one of the injector wires
and when cranking the computer should pulse ground the other wire causing the injector to pulse on of f
remove the injector plug wire and stick a noid light in crank the engine does it flash
if all ok it should
and then check your fuel pump and fuel pressure

The timing has to be on

As a helper cranking the engine u can turn the distributor left and right a bit
see if that help
if the distributor of a bit it should try to start but if a lot no

I wouldn't take the distributor out just for trying
rotating the distributor left and right should compensate for any timing of if any
if not then you are looking in the wrong area
and or timing chain is out of timing

Neutral
brakes on
shift to 4 low