Problems with my Kangoo 1.9 D

Hello friends, I have a Kangoo 2006 Grand Comfort 1.9 D, and the problem I am having is that on the route the march begins to reduce or go down, then it returns to normal and so on, they informed me that it could be a problem in the injection pump, it also accelerates at the start and then normalizes, and even emanates a lot of black smoke by escape.-

Hello . Look that you sure have a problem in the EGR valve, it is on the side of the admission multiple, try to disconnect it, it is almost certain that, if you have to change it is quite salty the price, luck,

It can be the EGR already said by GDMTORSPORT
performs a maintenance of the EGR valve. Carefully carefully get any dirt.
The EGR is in charge of recirculating exhaust gases towards admission to cool the combustion camera and reduce harmful gases such as NOX.
When this fails, the vehicle is commonly moisters and loses power. These can be open because of dirt.
It also checks everything that is hoses that leave it.
Luck

Check the filters also sometimes an object is covered or entered or if not when disassembling the EGR cleanses there are good products for it.-