Fiat Bravo 1.4s?

Thankyou very much for all help and advice so far to the persons whom replied to my last question.

Does anyone know what the "RED SENSOR" at the righthand side of the head postioned under the coilpack??
Also the"SENSOR" at the top section of the block underneath the inlet manifold.What are they and what do they both do as i still have not resolved the problem off "OVERFUELLING" at idle or the popping through the exhaust!!!! Yes i do realise i need a need new injector needle.