Awerums wrote:and then start up and drive for a few days then die back out?
2001 chevy impala 6 cyl
sorry,catalytic, lol im not real auto savy! lol
It's usually much more helpful to list the exact symptoms as best you can, and not speculate on what part may or may not be bad. My doctor reminds of this every visit.
Sounds like a vacuum leak from loose throttle body bolts. Intermittent dying could also be caused by a hot short in a sensor, or possibly other vacuum leaks at connections on the engine. If it's been more than a year since the last tuneup, that could also have an affect, along with a clogged air cleaner.
Not that you mentioned it, but the rotten egg smell is not a symptom of much more than the converter actually working. Most new cars smell that way until they break in.