im doin an dpfi to mpfi swap and wanna knoe where the eacv valve is located on the dpfi manifold a 91 si manifold and a 94 civic ex z6 manifold is located. also if i use a z6 manifolf instead of the s1 one what throttle body should i use. another question is waht is the eacv valve for, what is its purpose and wat can happen if not connecting while driving car