Backfiring - Running Rough - 2009 Smr510

Need help, 2009 SMR510. I gave her a good clean with plenty of degreaser and ever since I’m getting a lot of backfire on deceleration, bike loosing power and generally not running right. Occasionally stalling when taking off.

Sometimes seems to fix its self, normally after stopping and restarting it hot.

I’ve changed spark plug but still present. No obvious leaks on air inlet.

Next steps, was thinking of changing air filter and replacing the air inlet. Or giving up and taking to a shop.

Any ideas what could be wrong?

I dont know how much you was spraying something when do that degreaser, but sound like there can be in some electric connection bad connection