i have a 95 z28 with 160k on it.....i started my car this morning and its idling way to high, around 1500rpms and my ses light stays on all the time...when i scanned it the code came up tps to low....im wondering if i put it on wrong? is there a certain way to put it on, and also since my car wont downshift, is there anything else that could be causing this tps sensor to not work properly???