Trackpad Jumpy/Jerky

This is the Apple support article on trackpads:

http://support.apple.com/kb/TS1449

Some more things you may try:

Sometimes a very thorough cleaning of the trackpad will restore functionality.

Occasionally the MBP battery might expand and interfere with the trackpad. Open the MBP up (bottom plate) and inspect the battery,

Pickup the MBP and hold it vertically and press the trackpad a few times. Then repeat the process with the other end up. See if that helps.

Ciao.

Have you read this:

http://support.apple.com/kb/TS1449

Tried rebooting?

Try a SMC reset

http://support.apple.com/kb/HT3964

Try a pram reset

http://support.apple.com/kb/PH11243

Try a Safe boot, power down, then power back up holding the left side SHIFT key, press this key and hold after pressong the power button, hold until you see the progress bar, then you can release and allow it to finish booting, login and see if you have the same problem. (note that the safe boot will take longer than a normal boot, this will also disable 3rd party software, and some other functions) If it seems happy logout, reboot normally, and see what you have.

The next step to trouble shoot this would be to go to Systems Preferences/ Accounts&Users, and create a new account, (make sure this an Administrator Account) use the word "test" (no quotes) for all fields to create the acct so you do not have to remember anything, then after creating the acct logout, and login to the new account, see what you have.

If it works there then something is probably corrupt with your user account.

It's starting to seem that way, you may have a swollen battery which should be attended to immediately, so as to not cause more damage. If you have done due diligence on all the recommended tests/solutions, you you bring it in to an Apple Store/AASP (Authorized Apple Service Provider) and have the issue diagnosed. They will diagnose it for free and let you know your options. A swollen battery can cause much damage if allowed to remain in the machine, if you are not comfortable taking the MBP apart and checking it, then by all means bring it to a repair station and have it checked out. I, myself would stop using the machine until this has been confirmed/resolved, if all the recommendations have been unsuccessful.

All the Best

do you have full access to ALL of your files, in the new account? If so, and you should,you can create a new admin user account and use that. Use it for a time (when ever you feel comfortable that all is well) you can delete the offending account...but I would go for at least a couple of weeks to be certain all is well, and everything is what it should be.

By the way do you a back up system inplace? Time Machine or a clone, if not you should implement this ASAP on an external self powered (not USB powered) drive, drives are inexpensive these days, your data is priceless.

Hope this has helped you.

OGELTHORPE, you'r right, it did solved it, preassing the TP vertically, running perfectly smooth now, i was going nuts with this stuff!

i just don't know for how long, but whatever works for now, right?

Thanks mate