2000 SEL odd noise at Idle

[scalpel]

Recently(Last month) replaced the plugs and wires on my Windtar as it has 80K. Also changed the PCV and fuel filter at the same time. I just noticed it makes a different noise at idle then it did before. I don't normally drive it so I'm not sure it has anything to do with the recent changes. I'll attempt to describe the noise so I'll understand if you get a chuckle or two at the description.

It seems to idle around 800-900 rpm and has a "mutt - mutt" sound. It doesn't hesitate or want to stall but I can still hear the noise at initial accelration. There are no codes (checked at AZ today).

I used motocraft pugs with a different brand wire (don't recall off hand). I can't realy tell the location of the noise.

Any ideas? Thanks.