Hey y'all I need some help. I've had a shudder starting at 50mph but she runs perfect before and after 50mph. Changed plugs, coil packs and fuel filter. Now it's shudder starts at 45mph but goes away with a heavier foot. It'll die when I come to a stop. Gonna clean the throttle body, TPS and MAF tomorrow. Any other suggestions as to what my problem could be? Any input is greatly appreciated.