What do you mean by "Again....NO." ? I never said anything. I simply stated
what the  van was doing.

Without the motor running, you should be seeing battery voltage across
both terminals of the injector, as the computer end will be open
circuit. When the motor is running, the ground side of the terminal will
have a square like wave on it, with the off time changing width with
demand from the computer. You can't see it without a scope, so this test
is pretty much useless unless you know what you are looking for. IOW,
start looking for the problem somewhere else. The computer is slow at
making corrections to the mixture setting.

What is happening is after the engine starts, the computer looks at TPS,
MAP sensor, RPM, Temp, and adjusts the IAC accordingly. But the
combination of these things isn't in the range the computer is expecting
to see. The engine starts out idling high, because of the initial IAC
setting programmed in, and then starts backing down. The engine will
start to stumble, which the computer sees through the MAP sensor and
RPM, and tries to adjust the IAC back up. Then the engine revs past
where it was trying to go, and the cycle repeats. Disconnect the IAC
when you start it to prove it to yourself. The mixture is way off, and
the computer can't compensate for it.

So, something is out of spec. Look for a vacuum leak first. EGR is a
vacuum leak source, as far as this example is concerned. Also look at
the intake gasket, TBI base gasket, brake booster hose, vacuum hose to
Heater/AC stuff, PCV hose, etc.

Next, look to a leaky or faulty injector. Check the spray pattern, and
look for a steady dribble coming out the middle of one or both of them.
If you see it, chances are that may be the culprit. The injector should
be throwing a nice inverted cone pattern out. A trouble lamp is enough
to usually see the pattern well, but sometimes a timing light is useful
for this if you have one handy.

As always, post back results.