Hi, new to this site. Just bought a '99 Sentra Special Edition with a 1.6l engine on Saturday with 116xxx miles (no warranty). It's in great shape, but Saturday night the "check engine light" came on. We took it to AutoZone and code P1320 (ignition signal) came up. My stepdad and I replaced the spark plugs and rotor (and oil and filters). What else could we check to solve the problem? Dist. cap? Wires? This is my first car and I am learning as I go. Any help would be awesome, thanks!

Dan