Yes, make sure all your leads are in good condition, and make sure you not touching earth (the cars body).
I've been stung twice, once from an old carby motor (which would have been between 5,000 V and 20,000 V) and once from electronic ignition.. (generally 40,000 V to 60,000 V)..
It hurts alot, and can toss you into the air...
I ended up across the carport, and with chronic shaking from my right hand to my left for a couple of hours..
In that circumstance, a lead had fallen off, so, with the car still running, I lent on the radiator support and grab the lead, then saw a fat blue spark come out from under the insulated plug, and sting me on my hand..
I still live... Although it is certainly enough current to kill someone, because it sparks with each revolution of the motor, it isn't a constent current.
Therefore, rather than locking your muscles so you can't move; you get 1 violent zap and thrown free.
Lucky for me.... It hadn't even crossed my mind at the time.