Hello everyone, looking for some advice. or HELP!!!! Please. I working on a engine swap. I have a 2007 Trailblazer 4.2. I purchased A 4.2 out of a 2008 Trailblazer. Swap went fine Switched manifold, Intake, I believe cam sensor,(front rt. side) Crank Sensor (lower Lf. side) plugs were different. Everything else matched up( plug wise). Motor just cranks now.Getting fuel at rail presser valve. Any Ideas? thanks. Dm28.