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When I try to test my engine I'm getting this annoying message ' The engine is runnig too rich and is unable to run ' it happens also in tutorial mission when I try to test all engines in game pllsss heeeeeelppppp

That means that the fuel mixture slider is at to high value, you need to lower it a bit. For a race DI engine, 12.5 is the max value as of now.

It is OK now

I had same problems to test new engines made on sandbox demo. Playing scenarios I can test the engines that I just have to modify, but if I try to build an engine I just can't test it. The Dyno just doesn't work!!
How can I fix it???

When you say you have the same problem, do you mean its giving the "The engine is runnig too rich and is unable to run" too?

The usual reason why it won't run is if you haven't selected all the parts yet, maybe you haven't selected something for all the exhaust parts? Go through the tabs and make sure you've selected a part in each menu