my car starts to cut out one cilinder when hot and under load. idleing is fine and when the engine is cold also fine. could it be spark plug issue? i have new age coilpacks and it is not banging. just running in 3 cilinders occasionally when hot.

 

Yes, start with your plugs and leads. Usual suspects under load.

 

my moneys on a burnt plug

Also, my sti's ht leads are a very very tight fit, and unless they "pop" fully home, I can manufacture a similar stutter under load at higher revs

 

this is strange, i changed them 1,5 years ago and are done maybe 20000km. but of course i“m running higher boost now, maybe that caused spark plug fault?

 

it is not plug issue, when i turn left it stops and all cilinders work, but when right it starts. i identified a cylinder what is causing it. coilpack seems fine and it doesn“t bang. maybe wires to the coilpack is doing that?

 

still haven“t found the problem. when i turn sharply the car, can the spark plug suddenly start to work again?