Back again with a new slightly disconcerting issue from my car. This time every now and then when I start the engine it does a loud clank or taps at least coming from the engine bay. It sounded like it was running on 5 for a few seconds or in some cases half a minute then the noise disappears and the idle went smoother. At first I thought it was the sparkplugs but having had those checked, replaced, and checked again made it seemed implausible. I loosely gestured that it was the injectors, but I don't know. I can't send it to my mech tomorrow since I have to visit the hospital and I'm planning on staying home for the next couple of days because of my bad health at the moment. Anyone know what it might be?