i have a gsr and my speedo keeps jumping up and down, sometimes it would be fine but once i go into higher speeds it jumps up and down, at times it will sit at normal speed, any clue, thinking it was speed sensor but my friends say it could be the dizzy, and vtec still works.

 

How would the speedo be affected by the distributor? Your friend is likely confusing that with a jumping tach.

More times than not its dirty/corroded contacts on the speed sensor plug or the plug is loose on the sensor.

 

If it's not the contacts, check for a short on the speedo sensor wire. Not sure what engine models were effected, but sometimes it shorts to the back of the intake manifold from years of rubbing.
Another option, if you can, is to swap the instrument cluster with a known working one.

 

so i took off the speed sensor, and now my speedo is completely dead with the odometer, and check engine light comes on here and there, possibly bad speed sensor? and i have launch control set at 5500 rpm and it wont go pass there once i push it.

 

I bet you its the plug. Had the same problem a few months back. Got a plug from the junkyard, wired it in, wabammmm....working speedo again. And that was after a lot of multimeter tests.

 

Yup it happened to me.. Check the plug.

Sometimes it seems like its plugged in tight but try and snap it together and see what hsppens

 

my 95 dx has this same problem, i replaced the speed sensor, but it didnt fix the problem, so i replaced the cluster and it continues to have issues. but when it acts up, i smack my dash, and it goes back to normal??? wtf...

 

fixed the problem thanks to ONE-SIXX. unplugged the speed sensor plug and threw some coca cola on it because of the corrison and now its working fine.

 

You may also want to use electric grease. I used that and mine stopped jumping. Remember that Coke is also corrosive. Using grease will prevent it from happening in the future.