RE: Low idle very rough
Could possibly be a vacuum leak. I'd check the lines near the fire wall if that's where the sound is coming from.
1994 Ford Mustang GT
1990 Ford Bronco II
2001 Lincoln LS V8
1970 Ford Bronco
2006 Harley-Davidson Sportster Custom
If you don't already own a Ford (or Ford owned product), get one.