How bad is it? I get 8.5 mpg city and 13 hwy. I won't dare complain though, since 1. I bought a truck, and 2. I modded it a bit.
I sure wouldn't go with aftermarket ignition parts - especially Bosch! Nissans are super particular about their ignition components. I would go with all OEM specified plugs (NGK), wires (or get NGK or Denso from someplace like Psychology-based User Experience Design : Sparkplug), rotor and cap. I use Nissan Parts - Everythingnissan.com for my OEM parts supplier. If you had a lot of difficulty getting the rotor off of the distributor, it's possible that you twisted something a little and your timing is off - I did that on a Maxima once.i just changed out my cap and rotor and will be changing out my plugs and wires to bousch.