Hello all,

Looking for some pointers with an issue, s14 sr20det has a intermittent fault where the idle drops and almost stalls the car, this happens when the engine is warm and when sat still in traffic or having just parked but not all the time,

Good compression
R35 maf
R8 coil packs
Dw 740 injections
Welbro 255
Mapped at Horsham

Car runs and goes good otherwise,

Just need some ideas what to look at, a vac leak it would have a bad idle all the time ?
Again bad iacv it would do it all the time ?

O2 sensor ?
Too big injectors?
All work was done by previous owner

Any info would be great