[straight6chevyguy]

Ok so last weekend I started the truck and moved it in front of the shop it was barely running, sputtering and popping out the exhaust when I tried to give it gas.
Shut it off and tried to restart a few moments later but battery was dead, ok battery was low from sitting for almost a year and I had to jump it when I started it the first time that weekend. So next day I got a new battery and tried to start it but it will not start at all now!
Engine cranks fine with the new battery but will not start I have checked fuel pressure 58-60 psi with ignition on and with ignition off 58 psi and drops to 50 after maybe 15-20 minutes I did not leave gauge connected any longer than that to see if it would drop anymore than that.
I also checked for spark on one cylinder it seemed to have spark.
So I have fuel pressure and spark.
Any ideas what's wrong now?