Check all electrical connections. Make sure your multiplugs are all on the correct way etc.
Check all air lines to make sure none are old and perished with tiny holes you may not be able to see, and that they are all secure.
Perhaps the base idle is set too low as a simple check. Undo locknut and wind idle screw out to turn it up. I took my idle screw right out first and cleaned it as the end gets clogged with juicy bits of crap.
If you take the ISCV out and get someone to turn on the ignition, but NOT start it, usually the ISCV plunger will deflect momentarily so that's a simple check for that. Good time to clean and oil it too if you haven't for a while.
Check distributor phase sensor gap .2mm to .3mm between sensor and the lobes of the shaft, and make sure it has good insulation on its leads.
Check crank position sensor gap .6mm I think?
Throttle position sensor could be something to check as well. Apparently it's usually about right when the mounting grooves are centred on the screws, so check if it's visually way out in that respect.
If it starts, it must have fuel. You must be able to hear if the fuel pump is priming when you turn on the ignition?
That's my limited suggestions.
Tell us what things you changed as well as that could help isolate the problem.
Good luck
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