Took an evo that had a bad misfire to him once,changed plugs for hks ones(€140),fitted a boost controller(€700) and still misfiring. I asked if there was a chance it was an injector-I was told not a chance and took my mis-firing car home with my pocket €840 lighter. Got talking to a local lad at a rally after-told me drop the car to him tuesday-he rang me weds at 9.30-car fixed...cause of misfire????-dirty injector. I was claimed later by this "specialist" that the injectors were checked-they weren't as i was standing there all day while the car was worked on. And the lad who fixed it charged...wait for it...€70.