I am installing a gas stove and it requires 100v 14 amp service. Can I use the dedicated 100v 20amp outlet used for my microwave?

I think you mean 120V 15A feed.

If the stove is 100% gas and only requires power for the ignitor and clock/timer then you are fine using the micro circuit.

I think you mean 120V 15A feed.

If the stove is 100% gas and only requires power for the ignitor and clock/timer then you are fine using the micro circuit.

The stove does have a gas convection oven which does have a fan. But that should not draw much power. Ok still?

The stove does have a gas convection oven which does have a fan. But that should not draw much power. Ok still?

Yes. Doubt that fan draws more than a couple of amps.