Looking for a local garage or mobile mech.

[knfruitbat]

Living in Chigwell area. Looking for a recommended mobile mechanic or one fairly local to me. Sick of getting ripped off by Vx. Car has just come up with a fault code relating to 3rd Injector, although I have read this is quite often nothing to do with the injector. Garage I took it to, nearest one to when it started running like a dog, looked at it told me fault, but said when they had a quick visial of the top connections it seemed to fix itself, then they drove it across their courtyard and it came straight back. They dont deal with injector problems and couldn't recommend anyone that did. I have the yellow connectors, not new blue ones so I guess I start by changing those. Would like to change the vacuum pipes for the turbo as well, can't find a split but they are the originals by the look of them.
Car is Vectra 1.9 (150) elite estate on 04 plate.

[knfruitbat]

Thanks to Plasma (Dean) for your help. Was the wiring connector on injector 3.