I have a 2008 GMC Envoy. With 196k miles. I have owned my car for year and a half but. Within the last month countless stuff has happened to it. The blend door actuator (passenger side) went bad and had to be replaced. My lifters started ticking for a couple seconds apon start up. There is an exhaust leak and then a misfire (p0307). I also have other check engine lights codes too. P3400 P3425 P0106 So is all this caused by one problem? Or why is my car falling apart all at once? Should I sell my car? If so what should be my next car? I'm looking for a sedan or coupe under 18k and must be (RWD).
Most of those items are wear and tear items that will inevitably happen to just about any car. Start with the simple stuff.
A lot of things can cause misfires. Troubleshoot, you could have something as stupid as a vacuum leak. If there are any original vacuum hoses, replace them. It's 16 years old.
P0106 has to do with your MAP/MAF sensor not reading properly. Troubleshoot for vacuum leaks, and spray that MAF sensor with MAF sensor cleaner only. Don't just assume the MAF sensor is bad and replace it via the "shotgunning parts" method. It almost never works.
P3400 P3425
Your cylinder deactivation system is wearing out and not worth fixing.
