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Welcome, Charlie. I see you have one of the particularly rare and desirable Wall Climbing XK8 variants, equally at home on the blacktop as on the sides of buildings!
Ok chaps, got the car fixed alright . Finally it wasn't the key but the key transponder module . I'll provide all the details. First, you can find a used one on eBay. This though, goes with the entire reprogramm of the keys and fobs . Mine had just a loose plug, and every time car was passing over a speed bump , or a dent on the highway, was getting crazy, loosing the signal, and the immobilizer was activating the engine shutdown . Got it back plugged in and everything working fine. Below I'm attaching the diagram , just to see where it's located , and how it is . I would like to thank you for all your valuable infos.