Hi there

[[RDSR] Roba]

Garages tend to cost a bucket of money, and if the car has been standing for long, it's probably not exactly driveable on the public roads..

As AJ said, it can be anything, so you should check if everything's tightened up on the engine bay as they should be, everything looks okay and try to take a look at the engine while it's idling, maybe you can notice a problem?

And if still nothing, try to change the spark plugs Even if there's no problem with them, they don't cost much and will last for longer.