from what he explains about it happens when he shifts or letting go of the clutch and it does seem like you might have a grabbing clutch or broken motor mount check the motor mount like he said. Im saying this cause you didnt say if you had a misfire if you are having a misfire then obviously the culprit are those new sensors you put in i dont believe its the maf cause the car would be idling real low and sometimes cut off thats what happened to me at least hope u fix the problem