Eratic Rev Counter
Have just replaced crank sensor on my alfa, which was a right pain to do, started car and now have a new problem. The rev counter briefly sticks at 2300 rpm as the engine is revving then goes down to 1200 rpm whilst still revving, fluctuates for a few seconds between these values, then goes back to normal, but every time it goes below 2000 rpm it does the same again and fluctuates. Took it for a drive and it was hesitant at the lower revs.
Is this related to the crank sensor I replaced (possible faulty one) or something else. The car had been stood for a couple of weeks till I could get the work done so battery was absolutely dead till I boosted it, could it be because of this?
Would be grateful for any advice anyone could give.