How-To/Mechanics: i need some help please

so ive been riding fixie for a year now and i bought a xenon campagnolo crank set a month ago. until this week they have been working for me smoothly. however, this week when i was skidding, i felt my cranks skip and move as i was holding them steady. im not sure whats going on. can anyone help me out?

like im skidding and then i feel something wierd. it could be my bottom bracket. im not too sure. i stoo my bike and held my back wheel. i pressed down on the pedals and it moved . even when i was holding the back wheel completely still. i can move the cranks up and down even though my back wheel is completely still.

Did you check if your cog and lockring are tight?

ill check that right now. i tightened my bike crank and it fixed the problem a little. how would i tighten my cog and lockring?

easy way is to ride up a hill without back peddling to tighten the cog then take the wheel off and get a lockring tool and tighten it :]

yeah it is my lock ring and my cog. thanks guys!
i dont have the tools so do you recommend that i go to the local bike shop

Yeah I'd hit up a bike shop.
You may wanna take a basic mechanic's course if any are offered at any of the shops in your town.
To not know your cog is loose can be a pretty dangerous bit of ignorance.

No offense intended, but if you're a little butt hurt and it gets you in a shop asking questions then that's ok :)

I would think that, for a fixed-gear rider, there are certain basic tools that it's advisable to have around just for situations like this. One aspect of the stripped-downness of a fixed-gear bike is that although there aren't a lot of parts, they have to be aligned correctly, both for performance and safety...because you don't have shifting mechanisms and brakes to cover your ass if the alignment's wrong. Here's the tools I'd guess at, although real fixed-gear guys should feel free to amend the list:

1) Allen/hex wrenches for chainrings, seatpost clamps, saddles, stems
2) Wrench for crankbolts (whichever kind of wrench you need to tighten whatever crankbolts you have)
3) Chain whip
4) 15mm socket wrench for tightening/loosening axle bolts
5) Tire levers

The logical next item (IMHO) is a chain tool, and then maybe a pedal wrench. If you screw around with your cranks/BB a lot, you might want a crank puller. If it's any comfort, I'm an all-shifterized guy, and I have a ton more tools than this.

And I second the ironman's point: Asking questions at your LBS, and listening to the answers, is always a smart plan. I live in an especially bike-centric area (8 bike shops within 2 miles of my front door, and 7 more within 5 miles), and I cruise by a lot of shops. Most repair guys like talking about bikes, and enjoy answering tech questions; being treated like you know something is the payoff for having invested all the effort learning it in the first place. If you come in often enough and ask questions, and respond sensibly to the answers, you develop a relationship which can have material payoffs. The LBS I deal with most often has comped me all sorts of little bits and pieces that other shops charge me for - nuts, bolts, washers, a couple of sets of brakes, a rear rack, some baskets, an old BB...