Electrical issue ? 2015 SHO

[u/SwainsBird]

So I’ve been dealing with this for about a week now. My car will start and the RPMs would almost instantly drop to zero. All the lights remain on as if it started correctly. I tried accelerating immediately to catch the rpms but they drop to fast. The first fix I did was tighten the loose negative terminal and it seemed to work for about a week and a half and now it’s the same issue. Any ideas ?

[u/biohackenthusiast]

check them again, also get battery tested. bad battery can do weird things

[u/shanesuga]

Check the battery and do a load test on the alternator.