I have a 95 Contour w/ 2.0 liter manual trans. My car hesitates as I appraoach 35mph & 50 mph. My check engine light goes off when nearing 70 mph with a sudden drop in power & sputtering. Engine Mods include;Monster flow air filter w/ Ford probe after market air intake/ cat-back custom exhaust. I've tried reseting the computer with no improvement. Has any one have the same problem?