Ok, this JUST started happening today.
Every time i go to a higher gear, only on the up shift, the car studders what feels like a miss, but the stick shift shakes left to right pretty violently. It never used to do this until today. I thought it was the trans mount, but I haven't heard any banging underneath. Even if i go from first to second, the car shudders back and forth, after a few seconds it seems to stop once in gear(at about 2k+), but then I hit third and it'll do it again, and when I hit 6th, it does it pretty bad. This is all under normal driving, not even WOT. When I go from 1 to 2 under WOT the car does not feel right, I have no clue as to what is going on!?!?! There are no codes, and nothing is ticking, squeeking, banging, just the shifter/engine/trans is shaking violently in lower rpm's in every gear from left to right several times.
This is not from the cam, since this is a new shake and I know how the cam feels, not to mention this is under load.

What could this be?!

thanks
-Steve <---very concerned

 

Anyone? Anything?
What causes the shifter to bounce left to right very fast while in the 1k-2k rpm's

I'm very worried about this.
-Steve

 

Were you doing anything prior to it happening, any recent mods to the car?

 

bad synchros??

 

my tranny mount was bad and the symptoms where the shifter and the center console would shake and you could feel it moving. it would move on the up shift when going at good throttle to WOT.

 

Also, the cheap stock rubber motor mounts come loose from the clamshell and become loose and wiggle around.

 

Swapping out your trans mount is a cheap and simple procedure. I'd start by doing that and seeing if your problem goes away.

 

It's a broken valve spring
-Steve

 

[Homer]D'oh[/Homer]

 

broken valve spring? how do you know?