High EGT under torque and under acceleration cm2250

[amermextrucker]

Truck has 3.36 gear ratio. In 10th gear at 1500 Rpm's 70 + mph. Too fast for me. I coast or put it in neutral as much as I can.

Just changed air filter last week. Tire pressures are at 105 all 10. Truck is also demandated by a forum member. I usually run 9th gear ,1700 - 1800 Rpm's and 60 -64 Mph.

I went ahead and performed an injector performance test on insite and it passed. I was going to perform a leak down and cylinder cut out test , but I couldnt reconnect to ECM for whatever reason. I do have CEL for Ambient temp sensor . Im wondering if this could be issue ?