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How long since a tune-up? Can you check for applicable trouble codes?
Generally if it cranks good but won't start, have a helper crank it while you check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Make sure the battery has a full charge. Check your security system, where applicable. Only crank the starter for a few seconds at a time, let it cool off, a little.
First think I would be doing is checking the points? Get a spark plug disconnect one of the HT leads put the plug in and touch the threads to earth, if you get a spark that's nice and strong you know your ignition side of things is ok. If not remove the distributer cap and check for cracks, this can cause arking and loss of spark, once you've checked this remove the rotor arm from the top of the dizzy and check for pitting on the half moon like tip. Change any thing your unsure of as these parts are very cheap, next with all this removed put it in gear with ign off and rock the van till one of the 4 lobes is at its highest point with the foot of the points open... I'm not sure on the gap I think it's about 00.14mm but please check this, to be fair I would replace points and condenser any way just so I know there good. Once you have reassembled all this you need to check for fuel, you can check the fuel pump relay by having some one switch ign on while you listen to hear the relay click, and checking for a switch live at the pump with a test light next use the test light to check for a switch live/earth at a injector to see that the ecu is sending the pulse to inject, following all of this I am confident you will find the cause. Ignore checking and replacing lambda probes till you have got it running as a failed lambda probe will not cause starting faults, especially on a cold engine as lambda is ignored till engine has warmed slightly.
When you say it fires, are you checking for spark at the plugs ? In most cases you have to figure out if it is spark, fuel, or compression to proceed. A mechanic would also check the computer for trouble codes but you would need a scanner or code reader to do that.
Spray starting fluid into the air intake of the engine, if it starts and you have fuel pressure you have no injection or injector pulse as we call it. Check ECM fuse one and two for continuity if it starts with fluid..
On the fuel rail you will see a shrader valve, press that while someone cranks the engine to see if there is fuel pressure, check if there is spark at the spark plugs. You need fuel and spark to start. Let me know.
two things come to mind....
1- a electrical component may be heat sensitive and not function after turn off heat soak
2- your fuel pump check valve isn't holding fuel pressure in the fuel loop
Next time check for spark...if thers's spark it's a fuel problem