Okay I have a 2006 Chevrolet Impala LTZ 3.9L engine with 133,000 miles.
i was having an issue with my car not starting but it turned out o be a Lois terminal which I've already replaced. Before I replaced and afterwards though, my car would make a beeping noise when I start it up and have the e brake on; same noise as if I was gonna drive with the e brake on. It goes away once I take of the e brake. Sometimes while it does that my needle on my speedometer goes up and down by itself without me stepping on the gas or anything all while parked with the e brake on. If I try to rev it stays below 2000rpms and it makes a weird low grinding noise. once I disengage the e brake everything is fine. I recently had both the rear rotors and brake pads changed maybe about 3 months ago.

I also sometimes have my traction control light flash and I seem to lose power while driving. After a few times my light stays on along with my ABS light; wheel hub bearings were changed a little over a year ago. Tires are kinda worn out, I have a new set I'm going to put on tomorrow though.

Besides wanting to know how to fix these issues, do you guys think it'* worth it or should I invest in a new car? Thank you in advance.

Mike, is your crystal ball working? Mine is out for it'* 100K hours tune up.....