Vauxhall Tigra Fuel Air Filter Problems

press the button on the steering wheel and there's no noise

Eventually got the car going but no power on the accelerator

Had a new battery fitted now the roof and boot won’t open

Car keeps losing power , mechanic has changed throttle pedal , plugs & points , tried another ECU Kit , cleaned electric connections & fuse box for corrosion but still doing it , can anybody help , thanks management light on