87 camaro

Ok i have a 87 camaro with a 305 in it, I got it from someone else that i know. I notice that after i shut it off the motor will run for about 2 secs before it shut off. I also notice that while the motor is running if you try to loosen the distributor bolt with a distributor tool when you touch the bolt it will spark, I think whatever is causing the spark is making it run on after the key is off.:disappoin :disappoin

yea, you're definitely grounding out somewhere. check the coil wires for rub thru.