I have an 03 monte ss and it has lost all power. Can't gain any speed at all. As I give i gas
it falls off. Run perfect in neutral. I changed the plugs fuel filter and maf censer and it hasent changed. If I unplug the maf censer it runs perfect. Any ideas?

 

plugged converter.

 

Clogged cat! Lol

 

Thanks guys. Is there a way to unclog it or do I have to replace it?

 

Your only options are to gut it, run a pipe through it, remove it, or replace it. The first 3 will cause a CEL.

 

I thought if the cat is restricted that unplugging the MAF sensor would make no difference in the way the car runs. I would test and clean the MAF sensor to see if it makes a difference in the way the car runs before replacing the cat.

 

I replaced the maf and it didn't fix the problem I'm stumped.

 

Then replace the cat.