Lose power when under load/headwind
 

Dodge 2007 3500 4x4, delete system removed--Smarty Jr & a brand new motor (last one overheated due to fan wire somehow being cut without my knowledge--after several small trial & error repairs--figured the block was warped) Anyway--Was hoping that was what was causing my loss of power whenever I would hit some hills (with or without a trailer) & in a major headwind when pulling my 26' tool trailer on straight-away.
No such luck! It's doing it again. No trailer--hill--had to drop back to 5th gear & was lucky to get 60mph out of it.
Now what??:argh:

do you have gauges and if so whats your boost, egt etc at when this happens?

Don't have any gauges other than stock gauges.

Only seems to happen when it's under a high demand--
Failed to mention that it's only when passing another vehicle on a hill...not just normal driving on a hill.

hmm.....does it feel like it plateau's or actually goes down in speed, rpms and stuff?

Actually goes down in speed for a bit--then kick back up again.

Just an FYI:
Wound up just replacing the motor!