Dynamite .28 Big Red - Only Starts with HIGH IDLE and runs for about 20 secs

Ok so i have the Dynamite Big Red .28 Mach 2 Engine in my Revo, and i have to set the throttle trim ALL THE WAY for it to start and HOLD it or else it will TAKE OFF on me. And then when it starts it runs for about 20 secs and shuts off. It doesn't stay on. I have videos of me ding the break in and it was PERFECT!! now it does not run.

This has me very frustrated as i am about to give up on nitro and go electric but back on topic...

What do i do?

I had troubles with the throttle linkage as when i braked it would turn off but i got that fixed.

I am about to take it to my LHS and let them tune it for me.

But maybe someone knows or give me ideas on WHAT to check, like could it be an air leak or what can it be....thanks.
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