Well, for lack of not seeing any other products, I did put cheap stuff in it. I added STP fuel injector cleaner. At first it seemed to be working and the car was fine today. But then when I shut the car off, the engine continued running even though the tach was at 0 and then it took about 20 seconds before it actually turned off (it did this once before about a month or so ago). I then came back to the car a short time later and the car began missfiring again.
I know this might not be related but does anyone know why it would continue running? Also, should I try the Chevron Fuel Injector cleaner after this tank of gas?
