I Was Just Wondering Could Someone Help, I Have A 97 Mark 8 Lsc,150,000k At First It Started Out When I Start The Car I Had To Hit The Gas Hard To Get It Running Now I Have To Hold My Foot On The Gas So It Will Idle When I Let My Foot Off Of The Gas It Cuts Off And Sometimes It Will Stay Running And It Idles Up To 500rpm And When I Put My Foot On The Gas It Cuts Off Does Anyone Have An Idea What Could Be Wrong, I Got A Diagnostic Done It Said Nothing Was Wrong I Have No Check Engine Light On... Please Help..