Engine power

my cg10de k11 lacks power when climbing hills have to floor the accelerator and its like the engine struggles to speed up this is when you stop at the bottom of the hill and then you try to climb up. and normally on straight road it would go properly.
pliz any fellas can help me on this
 
check the back box and the cat i had the same problem then my back box exploded i got a new back box which fixed the problem.
good luck
 
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