Hi Guys
Looking for some input on what might be going on.I attended a Jet fly in Montana this weekend,with my Trim F-86,powerby a Ram 750p.The airport elevation is 4800 feet and the temp was around 100 degree,not ideal for flying !My engine was making a howling-moaning noise as it came off idle,and happened once on final when i added powered just before touching down.The next flight,i added power to start my take off roll,the vibrating-moaning started again,i added more throttle and the next thing i saw was a 4' flame shooting out the tailpipe.After put the fire out,ipulled the bypass cover and test ran,sounded ok.Just wonder if the elevation and heat could cause this or should i look deeper ?

Thanks for the help!
Charlie