my 1993 r33 S1 is doing the same thing but this is what i have done
tried different fuel pump, changed fuel filter, had fuel injection flush for 9 hours, AIR Flow metre, O2 sensor, changed all my coilpacks with 2nd hand ones that have done 29000kms, changed ignitor coil, changed oil, checked for damaged rods and cams(no prob) auto electrician has checked the alternator and the regulator is fine except when he hooked up his computer on idle when it was playing up the air fuel graphs went off the chart.
he also told me not to come back because my car apparently blew up his hand held computer. luckily i had already paid the service fee and said see you later.
except my car sound like a wrx at first the goes rotary.
could be doing 100km/h and as soon as it gets to 2000rpm drops down to about 300rpm
sounding like a rotary (blip blip blip blip blip blip)
its Fu@#ed
its gotta be the computer i have changed everything else
Any thought..........................................?