As was already mentioned, the Firebird does NOT have an elevator. You climb by adding throttle.

Either your friend tossed it pointing up, rather than straight out, which resulted in the stall, or your rudders on the V-tail are both trimmed "up" a little, which is causing the plane to climb too much.

As was said, the Firebird is very marginal to fly, and if it's out of trim probably won't.
Dennis-