Mechanics' Magic Spray?

TacticalDad

Newbie
Points
1
Location
London
Car
Vectra
Hello guys,

Newbie here from London. I have a question regarding this magical spray that a mechanic used on my vehicle after it stalled and wouldn't start until he opened the pipe coming from the air filter into the engine whilst I attempted to turn the engine over. He managed to start the engine instantly. Does anyone know what this spray is?

I imagine the engine stalled as too much air got into the cylinder compared to fuel and wouldn't ignite, but what does this spray actually do? Any help appreciated for future reference!

Many thanks
 
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