I have had exactly this problem with two cars a skyline gts and an S2 both times it was the spark being blown out under boost, thats why its better under small throttle inputs, it could of course be a million other things but i would suggest new plugs, it is a very common thing on skylines and cossies I believe the solution is normally to gap the plugs right down or fit stronger coil packs either way spark plugs should be your first port of call as they are the cheapest.
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S2 Avant -
Mine has boost protection cutting in at the moment but i think this more than likely is the cause.
1994 Indigo Blue S2 coupe
1994 80 Avant 1.9 TDI
2005 Yamaha Fazer 1000
1953 AJS Model 18SComment
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Well we put new plugs in today (The Bosch ones as recommended on here) and its still exactly the same
I ordered a 70-60mm reducer to do the MarkH mod, so Im now hoping that might solve it. (Whats the chances of that?)Comment
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My hesitation was the Diverter valve not sealing properly ,it is a miltek one in alloy
and the piston was gummed up where it should seal thus boost pressure would not
build properly ,hence hesitation .sigpicComment
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