Thread: Hellp - V8 missing/chugging

Replaced the spark plugs yet?

Could also be a vacuum leak somewhere.

OK. Let's calm down and fix this. Is the service engine light on? Has it had a tune up recently...like spark plugs and wires.
Sounds like it could be a vacuum leak. But we need to get rid of the easier to fix things first

if it sounds like a vacuum with a full bag, the cat could be clogged up. like its trying to suck in air but it cant.

Originally Posted by Scottydoggs

if it sounds like a vacuum with a full bag, the cat could be clogged up. like its trying to suck in air but it cant.

I agree. So check all the lines on top of motor to make sure their not ripped or broken. Check for vacuum leaks and all.

sounds more and more like a clogged cat. you can pull the up stream o2 sensor, if it runs better ( with this exhaust leak) the cat is clogged up.

you can also drive it at night, get the car good and warmed up, get on it some, then pull over and look to see if the cat is glowing red, if so its shot.

you can also when the car is cold, bang on the cat, if you hear it rattling inside, its also shot.