Cummins isx headache

[Chamberpains]

I dont know much about the cm2250's and cm2350's but it Sounds like you have some sort of governor kicking in. If you have Insite, see if you have a speed or torque limiter set. My old cm870 has settings for light and heavy load limiting also there are gear down settings on it. I disabled all of them. Their highest settings are right in the rpm range I run my engine at. So away they went.