P0216 is unable to stabilize the injection timing, or the timing is physically too far off for the PCM to compensate. First, make sure the pump is secure and not wandering around while it's running. Other than that, it could be air still trying to work out, or something just sticky from sitting. It would be a good idea to check the quality of the fuel (or simply replace it). The fuel doesn't sour, but a couple years is a long time for other things to do bad things. Also, check for rodent damage, just because. Get it up to operating temp and let a couple/few warming cycles work out what it can.