replaced timing chain guides on a 2000 ford 4.6l v8 sohc starts had good idle but no power when put in gear retimed many times same problem so gave up for the night retimed it again today and now cranks over but wont start and has no compression use compression gauge on 1 and 5cycl and it didnt move replaced plugs and tryed again placed hand over intake and u can feel it try to suck but very very little.... used marks on chain and gears to time it..... need help!!!