Hi Guys so I just finished Replacing the front and rear timing chain cassettes in a 1997 Ford Explorer SOHC 4.0L. I just got the engine back in and everything ready then went to start it up for the first time and all it does is Rev all the way out then dies. Throttle plate is not stuck. If I hold the pedal down slightly and try to start it then it spits and sputters backfires. (no more timing chain noise which is a plus I guess). What did I do wrong Im kinda freaking out now I followed all the guides from 2000streetrod here
http://www.explorerforum.com/forums/showthread.php?p=2349038
Double and triple checked everything

http://www.explorerforum.com/forums/showthread.php?p=2349038
Double and triple checked everything

