Strange noise started today, car was "missing" this morning *vid*

[phatcyclist]

When I started to drive my car this morning, it felt like it was missing on one cylinder. It wasn't cold and the vehicle normally comes to life just fine even then. After about a half mile the engine seemed to be running on all 4. I drove it most of the day and went through a morotbank when I noticed this noise. It doesn't sound like valvetrain because it doesn't have a harsh sound to it and it doesn't knock or get louder under load. The noise is synched exactly to the RPM and it is barely noticeable at idle. I am hoping it's nothing serious since I have a 100 mile trip tomorrow.

http://www.youtube.com/watch?v=Z299D49Hj3E

 

[phatcyclist]

Really? No one has any ideas on this at all?

 

[Tom W.]

So, it's a 98. Sound is almost like the engine is missing. Is acceleration normal? How long since a TB change?