"The Ark of the Sun God", a.k.a "I sopravvissuti della città morta" (1984)
"A safecracker takes a job where he must go to Istanbul and steal a sceptre that once belonged to the god Gilgamesh but is now in the temple of a secret cult."
You can watch the complete movie here (with foreign dubbing):
0:72:00 mark: fast cars chase
0:74:36 mark: hot lava
Near the end of the movie they are in the temple with the body in a tomb, there is the scepter with the huge stone, and at the end the ground cracks and there are glimpses of the hot lava. Earlier in the movie you can see the fast cars.