Engine doesn't want to shut off sometimes

Ive noticed the same thing in my V. I noticed it idles around 12xx. I have a gauges on my stereo. I feel a slight delay one second during acceleration before it kicks in. I'll shut the car off and it will act normal after that. A buddy let me borrow the DrPrius app. I ran a few battery check ups on a few prius I own. I run three amplifiers just above spare tire compartment. They run hot. But I found something else....