2003 Mack E7 power issues

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{"text":"On the 2003 Mack with a 350hp E7 and allison auto tranny that we just purchased a few days ago, i noticed driving it home that when pulling hills, then sometimes when you put the pedal down to pull the hill then the turbo spools up but then sometimes after 5 seconds or so then it will spool up even more and it has quite a bit more pulling power even though the tach doesn't move. It does it with the cruise on and also with it off so i don't see how it could be the pedal sensor. Could this be what they call a dual HP engine? Why would it be doing this? It didn't do it on every hill, sometimes it had the extra power immediately but other times it was delayed.","pics":"[]","canComment":true}