Hi all, just wondered if anyone can help.

A mates saff has got a weird problem when your on very light throttle, like pulling away from stationary, or when, in say, 4th and 5th and your on trickling throttle in flowing traffic (like 40-50mph).

On boost, its fine, pulls lovely, no missfires, or anything. Same as when the car is on full load, i.e, say 5th car, 40mph, no boost, but foot is on the floor.

All the igntion system has been changed to a MSD stg3 chip, and MSD coilpack conversion, with new 071's gapped @ .6mm. The car did exactly the same problem on the old chip/ignition setup, so its not that.

put the car on my gunsen CO2 meter, and was originally running 12%, but got that down to 3% by adjusting the ECU. Havent checked fuel pressure yet, so need to buy a gauge.

any suggestions on what to try next?

Thanks!