Mates call me Pedro
I'm new to this site and I'm needing some help please

It's a 1997 brava 1.6 (100sx I think)
Won't start when hot
Starts no problem when cold and will run all day no problems I've recently done a 450 mile round trip to lift parts for a bike (didn't have to turn off the car)
When hot it will start if you turn it off and straight back on again but if you turn off and leave it any more than about 30 secs it won't start. If you gas it it will start and run really lumpy if you keep revving but it will not idle
Crank sensor was changed
Then. Injectors
Don't know what to do and my mechanic is somewhat stumped

Also injector light was on before I changed the parts and are still on even after ecu reset but no fault readings on diagnostic machine

Please help
Pedro