alien.earmuffs@gmail.com Wrote:

timing is not going to affect that...

My 94 Altima had a notch on the distributor and a mark on the collar that
the distributor slides into, that when aligned set the timing correctly to
20 deg. btdc at idle (with the TPS disconnected).  Your miss at idle isn't
likely to be caused by the timing being off, maybe you have a dirty egr
valve or a vacuum leak somewhere.

Useing a timing light, follow Nissan's timing instructions as JM has
perfectly described for you. Tighten your distributor down, recheck and
don't move it again.

If moisture collects in the sparkplug tubes you will get a miss-fire
rough idle and under load. You may need new sparkplugs. Inspect the
plug wires for corrosion and moisture. Inspect the hose between the
MAFS and the throttle body for proper installation and secure clamps.

Very likely you will find the problem is a vacuum leak between the
intake manifold and cylinder head around the #4 intake runner which is
very common.