I have a Vauxhall Zafira and I am losing power, and have white smoke coming out of the back of it. I have had a new reconditioned engine put in literally 2 days ago to fix this issue as they thought it was the only option at the garage but the issue persists. I really cannot afford this as I am a minicab driver and I’m already out of pocket and consequently not earning. Does anyone have any idea what it could be? The garage have also said my coolant hasn’t decreased. Cheers for any advice.