My Sentra will not start, it will crank but no spark in any of the spark plug wires. I have changed the distributor three times thinking that might be the problem but still nothing. I had replaced the fuel pump a couple of days before and it was starting fine but after I replaced the Rear Main Seal and the alternator. I put everything back together and that's when I started having this problem. I checked fuel pressure and its fine and all the fuses are also fine. When I try cranking it after a couple of seconds check engine light comes on and code is P1320. This code has not help me at all. Can anyone please help me.