BUCKING Bronc (99 Cavalier)

HELLLLPPPP!!!!! Anyone found a cure for this yet?? I have this problem with my 99 Cav with Standard Tranny. It bucks like a bronco. Clutch is OK. I replaced the Oxygen Sensors, fuel filter, wires, plugs, MAP Sensor, TPS, Coils, injectors and am about ready to trade it I am so teed off. I took it to a Chevy dealer and scanned it with the hi dollar techno scanner. All they could tell from all of the scanner screens was that it had a five count miss. Hi dollar scanner and mechanic could not tell me the problem. At least they didn't charge me for it. Mechanic told me to let him know what it was when I found the problem.The car bucks all the time. If I floor it from a start, it does accelerate but stutters at speed. Ran great to about 140000 miles then started doing the bucking bronc. Anyone found a cure??? HELLP ME PUHLEEZE?:banghead: Please post here and on my E-Mail www.johnniegutierrez@hotmail.com (http://www.johnniegutierrez@hotmail.com)
Thanks Everyone.