Help with Intist Contour 2.0

Hello comrades, in a contaur mod.96, the problem is as follows, it takes a long time to start and once you start it you can turn it off and the instant it again starts without problems, but if I leave it out more than half an hour again it no longer starts and it costs a lot to start it, clear the rail of injectors and when you open the switch I hoped that someone had to escape and that this would be drowning the engine because it even seems to The spark plugs come out very black even when I had just cleaned them, but my surprise was that the injectors did not drip the rail pressure and remains in 2.5 bars,
I would very much appreciate any suggestion, but in advance thank you very much

It may be due to problems in the spark plugs, which has a thermal degree differ to that of the manufacturer.
-Stour resistance in spark plug cables, little spark can cause not to burn well.
- If it is AEIT what spark plugs have, check status of compression or valve seals.
luck

Thank you very much my good Guillermo,
I will pay attention to the spark plugs and cables, with regard to the dirt of the spark plugs is soot, it is not of oil but of excess gasoline, so it supposed that some injector would have a leak but it was not so,
it would notwill the entire ignition system,
and again thank you already inform you that the case ends,

It could be the sensor, the one who sends the signal if the car is cold or hot, and suddenly that is why once it heats it turns on easier, since it does not require the extra gasoline that requires when the engine is cold, friend plays to eliminate possibilities, luck with your problem !!!

Thanks Sofi,
a very good point, I will check the temperature sensor,
which worries me even more is that the camshaft sensor was out of position, the screw that fixes it was almost to fall and the sensor out of its accommodation, and worse even though when it is disconnected the engine continues to work, I supposed that this sensor in conjunction with that of the crankshaft are the ones that determine the spark. Being disconnected?