R33 Problem

[r33adzaskyline]

hey guys i recently brought a r33 series 2 skyline it was running all good and was happy with it after bout a month and a half of driving it around its started playing up now ive been told that in hot weather like it has been the coils can shit em selfs but to me seems like airflow meter , also been told could be igniter module as im not a millionaire i was not guna go out and buy the hole 3 items but would like to know your feed back on wat you all think it is .. it idles but seems like it has slight miss taken off all fine but under boost (10psi) it starts to cough and splatter like as if it is hitting the limiter it has 550cc injectors bosch fuel pump 040 different turbo (bush shitty one) dr drift computer and 300zx z32 airflow meter and your normal frount mount and that. ive recently replaced spark plugs , cleand airflow meter with electical cleaner cleand airfilter with k&n filter stuff gone over all intercooler hose clamps checkd fuel filter , put it on snap on scan tool read nothing ..