Engine run ruff misfires

What is your question?

My car runs ruff and idols ruff. Getting crap gas mileage and it run hot. I've done radiator flush. I've done themostat. I've gotten codes that say misfire. I've got the code gave in my cash flashing. Low oil. Low tire pressure. Service engine soon all that flashes at me when the cars running. I'm sure I hear a whining noise driving the car. I know it had a breath test for DWI. It's got a cluster of wires on the battery terminals. When you shut car off it makes a noise like a sigh or something. The front end makes a popping sound sound corners and turns. The cars real squirrley and I'm not sure.

What makes this problem better or worse?

It does it all the time

How long has your 2005 Pontiac Grand Prix had this problem?

Since I bought it on mother's Day