Thanks.
1. The throttle bodies were cleaned up.
2. After the custom exhaust were installed we did retuning - fuel and ignition maps were changed.
2. The custom exhaust is 2 x 2,5" with no catalitic converters and six customs mufflers. I do not think that there are leaks, but it has less back pressure than OEM exhaust.
3. I had connected Osiris and did not notice any strange when this issue occurs or I did not know on which parameters should I look.
Could you tell me which parameters should be logged or changed?
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