I have a 2002 civic si and the check engine keeps coming on and when you tack 4000 rmp it studders and won't let it tack over 4000 rmp.well i put a scanner up to the computer and the code that it was reading T 1259. i called a local honda dealership today and that said it sounded like a vtec solenoid. does anyone know what the code T1259 is and if it is the vtec solenoid where is it located at on the engine and how easy is it to change?