Fordlaser problem

Sometimes my car has trouble starting. The car will***** while driving not all the time and also while im accellerating it feels like somthing is slowing me down kinda like im useing the brakes then all of the sudden the power will come back then the car would do a burnout if I was in first gear because I would be giving it full throttle because its not doing anything but slowing down. It happens every now and then. Also my my car just stalls if im goin really slow with my foot still on the clutch thats happend a few times only. Ive tryed changein spark plug leads and sparkplugs and it still does it. The last thing my car had was a tune up they changed the fuel filer, airfilter and gave it correct idle timing then the******** problems happend like a month or 2 arfter that.