hello all,here i am again asking experts and novices alike.My engine management light came on,a mechanic put on the diagnostics and it indicated that the high pressure valve sensor on the rail was the problem,the wireing plug was reconnected and error code was erased,and the management light went out,ive driven approx 100 miles since that and i have felt the engine sort of stall,like for a milli second but then seemed to be ok again.i have a new sensor but as yet it aint been fitted,should i go ahead and get it fitted or could the problem be elsewhere? anyone encountered this problem before