Turbo problem d13

I'm having issue with my 2012 vnl Volvo d13 ishift we replaced the turbo and turbo actuator afterwards I noticed that there was a lot of oil leaking from the turbo and the turbo actuator and all over the bottom of the truck I'm also having problem with the truck I will be driving on the road and all of suddenly I would lose power press the gas pedal and nothing then after about 2 minutes later it would go back to normal sometimes I would get check transmission also when reversing the truck will jerk and sometime it will not go at all sometimes I would have a long crank to start the truck in the morning
I have changed the oil and oil filter air filter fuel filter

 

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