A couple weeks ago i had posted several times about my car just dying and all the things i went through...turned out it was the engine crank sensor which im guessing runs the tach. I havent had any issues for over the past week but this morning it was a little bit chilly and when i started the car the tach gauge hesitated. I kind of sat there and wiggled a little and then jumped up to where it should be for a cold startup...any ideas?

Im hoping its not that sensor again cuz it was a pain to replace and its brand new...