Customer just bought the car on way home oil light came on so he stopped and recovery bought it to us. We found oil pick up pipe blocked so replaced. On starting there was a load rattle from turbo area striped and found main spindle snapped due to lack of oil pressure so replaced with new one.
When road tested car holds back then surges then holds back.
I have no codes have done a smoke test for air leaks Checked fuel pressure. when driving actual boost pressure rises higher than demanded pressure the you see wastegate operate and this is when you get the surging. Any body any ideas