hi dont know if anyone will know but got to be worth a shot, my 850 t5 wont start, when you turn the key the engine turns over but doesnt fire, BUT the strange thing is that the rev counter goes up to 3000 rpm and back down to 1000rmp and up and down, but the engine is only at cranking over speed, i have fuel to the rail but the spark seems to be half hearted, think it might be the coil (new one coming tommorrow), but why is the rev counter goin up and down, is this a sign of any sensor failing (cam sensor maybe), the are no fault codes either, i dont think there is a loose connection as ive checked everythng with a plug, any help would be great, thanks
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