....My Impala will start normally at times, other times when starting, there is clicking but will not start.....If I tap the gear shift lever when in Park a few times, this Chev 2008 Impala will start....any idea of which part is defective or intermittent?

 

Did you find a fix? I've had mine in four times -- even to the dealership! And it still needed a few key turns to start today.