Avoid missile in a canyon run

[CBStu]

I downloaded a user file mission where you make a fun canyon run on your way to try to blow a Russian AWACs plane. I get maybe 3/4 through the canyon and a Mig29 pops up on the EW screen and soon fires a missile at me. I have tried keep flying and eject flares or chaff. I got blown up. The idea of the canyon run is to stay off radar which seems to work since this isn't a SAM problem. But the 29 has me. I was hoping that staying in the canyon would lose the missile tracking but no luck. The 29 shows on EW but not on radar so no way to launch a 120c. At that point should I come up out of the canyon to be able to make evasive maneuvers or ?? Come up out of the canyon as soon as the 29 shows on EW and try to shoot him first ?? Any suggestions will be appreciated.

[razo+r]

If possible, force him to go defensive before he forces you to lose your wings. 

Depending on the terrain, you could also try to deviate from the route in order to hide behind a peak.