So I need to have my injectors cleaned on my 94 WRX and I've heard good things about carbon cleaning. The engine will idle roughly when up to temperature and struggle to start as my fuel injectors were second hand I think they need cleaning.The service looks like it will cost £89.99 and take 30 minutes does anyone know how effective it is? Mainly will this clean out my injectors as well as a usual injector service or not?

 

Any help would be appreciated

Why not get the injectors serviced at a specialists?  That way you get a warranty on any work and they can flow test and make sure the spray pattern is good. I'm not a fan of stuff you tip in the tank.