Engine Performance problem
2003 Renault Kangoo 4 cyl Two Wheel Drive Manual 220000 miles

hello
my engine will Hesitates i had a lot of burned oil ( comming from oil breather )that turned like greese in the case holding the air filter that would drop in the air manifold
when i cleaned that the hesitate almost stopped
sill i have some black smoke when high speed
i opened the egr valve and cleaned it and checked it is ok now i still have the problem of smoke
and the hesitation happenes only till the motor warm then go away
still when i remore the electrical plag going to the egr...every thing is fine on hesitate and very little black smoke ... car is working wonder full
what more can i do .. maybe there is a egr sensor cant find where it is and how to check\clean it