[fredjacksonsan]

What year is it?

A plugged cat will cause some of your issues, and I'd suspect that since you said it's rattling.

But also, some of your symptoms could come from a bad Crankshaft Position Sensor. Do a search under that and CPS and see if they match. The CPS usually lasts about 90-100k before quitting.

But since the cat's rattling I'd do that first.