How Do I Fix My Van?

Knowing the yr, make, model, etc. Would be helpful

Here's some simple things to check
1. Fuel filter- as time goes by it gets clogged easily.  If it's a inline filter it will be held down by and strap and bolt running along the passenger side frame rail.  If it's the tank style, you'll have to drop the gas tank, not a fun or easy job.
2. Check the ignition coil, if equipped, to make certain it's sending spark to the spark plug
3. Fuel pump- it can and will go bad sooner or later.

One option to try is to go the local parts store and see if they can help you with getting or purchasing a engine code reader.
Price ranging from $20 to $500 (complete kit for a wide range of vehicles

You seem to be confused. How can a vehicle start without turning over first. You engage the starter by turning the ignition switch (key) The starter engages to the engine and turns the engine over until enough compression is built along with fuel and spark to cause the explosion so that the engine continues to run after the starter disengages.

Older chryslers where bad about blowing a ballast resistor but I would think they no longer use those. This device would give the coil full power while cranking and reduce the power once the engine was running. When it goes bad, the engine would start but once you let go of the key,the engine would die.