CA stimulus is going out for ppl who are 75k and under. I filed married and combined we are over but individually my wife is under. Should/can I amend to be eligible?

[fanfare]

you have to prepare it both ways to find out which is more favorable.

No one here can tell you what the outcome will be.

[VolvoGirl]

Do you mean to amend to Married filing Separate?  It's too late to change to MFS if you already filed Joint.   But here is a CA page on eligibility.  Scroll down to see MFS and amounts.

https://www.ftb.ca.gov/about-ftb/newsroom/golden-state-stimulus/help.html  

If you file MFS you may end up owing more than you would get for the Stimulus.   So it may not be worth it.