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Pull up and press down while pulling it should start to work lose if you man handle it. Up down while pulling I've had some very stubborn gun stocks on ak rifles before. I have never used heat unless it looked like there was wet lacquer applied while stock was on gun. Sometimes you need a buddy to hold the front while you man handle the rear.
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+1 ^
Sometimes you just have to crank up the elbow-grease. Having someone else to help hold the rest of the gun while you pull on the stock might help, but if it turns loose suddenly, both of you may loose your balance. :-)
If you don't mind possibly scaring the stock you're removing, and you don't have a helper to hold it, you might take a rubber hammer to the vertical edges while holding the rest of the rifle muzzle upwards. Of course with the streight edges of the AK stock, there is not much to hit with the rubber hammer to get rearward force on it.
If it is still stubborn, you might be able to remove the dust-cover, spring and bolt-carrier, and get a hammer and something like a socket extension on the inside and drive it out, without damaging anything else, of course.
Good luck.