Car Vacuum Leak Test

2009 BMW 3 Series E90 Vacuum Leak Test with a home made smoke machine. This is how I made the smoke machine:    • Making Smoke Machine for under $10   How we fixed the problem:    • BMW PROBLEM SOLVED - Vacuum leak fixed wit...   The description of the problem from the owner: After having the valve cover gasket replaced on my E90, it ran okay for a while before fluttering at idle. Eventually the engine would shut-off at idle and through a check engine light. Scanning it with a ODBII scanner revealed a system too lean message and cylinder misfire. It showed a P0171 and P0174 error codes. And that's how we repaired it:    • BMW PROBLEM SOLVED - Vacuum leak fixed wit...