Ok so car has had acceleration issues and throwing P0300 codes, after some prior posts I read I pulled the front O2 sensor(before Cat) and it had lower power but it was running way better and no more P0300.

Then I put it back in, dumped some cat cleaner in the gas tank, and ran fine for a couple weeks.

Started up again so I pulled the O2 sensor again. Rand for about 5 mins like before, then a major power drop and barely limped it home.

Is this just the Cat getting even worse, or is there some other issue potentially that I'm missing.

Also not sure if it's related, but my heater core was leaking, so I bypassed it for now, already ordered a new one.

It's a 2006 LS 2.2L

 

Well the o2sensor has nothing to do with that code. Check your spark plugs and your ignition coil

 

Change the pack ontop of the valve cover.

 

What this guy said

 

quincy!!!!!!!!!!!!!

 

Helllllllllll yeah! I miss you guys.

 

Would that cause the loss of power? And if that was the problem would the Cat cleaner I dumped in the gas tank have helped even if it was temporary?

 

Are we talking about the coil pack or the ICM?

 

ICM should be no need to replace the whole pack. Paid just shy of $80 for one at the local stealership.

 

So I found an autozone that actually still tests ICMs, gonna have it checked, it's it's good I'm going to get the coil pack, if it's bad I'll replace the ICM and we'll see how it goes.

Botha parts are each $80 so def only wanna have to buy 1 of them

 

The P0300 code is common for people. It's the code you get when you haven't owned this car for very long. It's actually just your car reminding you you're driving a chevy.. just so you know.

 

Yes. I had mine go out around 64k miles. Was around $50 but that was at a saturn dealer.

 

Update: so I replaced the ICM and it ran good for about 50 miles or so then started up again.

I replaced to coil pack and bingo.

Also just for the hell of it after that I put the old ICM back in to see if it was just the coil pack but the problem came back.

So I had to replace both

 

good to hear it's working again. too bad about having to replace both, looks like some of us lucked out.