About a month ago my computer told me that my coolant was low. I checked it out and there was just a little missing. I put some more in and forgot about it. A couple of days ago it did it again, but this time there was much more missing. I've been check ing the ground where I park and there's never anything on the ground. Where's the coolant going? Is there anyhting I can check myself (being the gifted mechanic that I am
)? Also, the car sometimes missfires when I'm starting off (manual) like it's not getting anough gas. Could one thing have something to do with the other? Do I just need new sparkplugs?