Going down the road the van stalls, battiey, starter, an altnater all works good.. but wont crank it just clicks

STARTER DEAD MEANS NO CRANK????????????
CRANKS FAST BUT DOES NOT START, MEANS JUST THAT.?
OR cranks then STARTS AND STALLS.?
I CAN NOT UNDERSTAND THE END OF LINE 3 ABOVE.
WE CAN NOT HEAR YOUR STARTER SPIN FAST, YOU MUST SAY IT AND TYPE IT. OK.
THE IDLE CONTROLS ARE FAILING (IAC VALVE)
OR you never got tune up in 20 years? and the spark plugs are shot.
as expected 100% that.
IF BY CHANCES IT DOES CRANK FAST AND WILL NOT START
UsE 5% right foot throttle to start the engine,

if the starter is dead, shift to neutral and crank that way
the users guide (free) tells how.

a starter can be dead silent
or clicks
or chatters
or goes GRRRRRRGVRRRRRR that load cranking sound.
what does your starter do in line 3 , hot started.

If you put a volt meter on the battery and it reads 12 volts before you cranked the engine and it drops to 10 volts or less when you crank the engine, this indicates you have a bad cell in the battery and you should replace the battery because it is not holding the charge. The loud click sound coming from your starter is because you are not supplying enough voltage to energize it.

Pull a spark plug and see if it is firing.

Turn the headlights on and watch them while the key is turned to start. If the lights go out, one of your cables or connections at battery or starter is not good. If lights dim a lot but stay on, possibly a bad starter, it needs testing. If lights aren't affected by cranking position, turn lights off, pull the small wire off the starter solenoid, hook up a test light to ground and to the solenoid wire. Light should come on when key is held in crank. If it does, likely a bad starter solenoid. If no light, then the start circuit from ignition switch to starter solenoid is not working. Check for power out of ignition switch on the start wire with key in crank, to begin with. If powered, switch is good, need to check if neutral safety switch is good, and then check or swap in a new starter relay.
Post back with any results.
Good luck.

Check the fuel pressure

To clarify - the engine cranks then starts.
If it won't crank in any gear, I would check the neutral safety switch first.
You can also jumper the starter solenoid to make sure the starter will crank the engine manually without the circuit from the key switch.

You filled the cylinders with water. You will need to remove all the spark plugs and crank the engine with them out, to push out the water. you will also want to replace the air filter as it is probably saturated with water.

check your connection.

first check for voltage at starter with test light or voltmeter if u replaced alt without disconnecting battery u may have blown a fuse or fuseable link check fuse box under hood

check the small connector at starter for voltage when cranking if ok try the hammer test if starts bad starter (ie) tapping starter with hammer while trying to start.