Ok...done the same things to fix it, but now I'm getting a error code reading that the knock sensor is bad...is this why it won't run? I would assume that the knock sensor would slow the timing some, but enough to keep it from running??? This car has me a my wit's end. Here's what I have replaced in the 10 months I have owned the car:

Both timing chains
Distributor (twice) thank goodness for part warranty!
spark plugs
plug wires
fuel filter
LF rotor (guy who had it before NEVER replaced the pads!!)

I got it started once...seemed to run fine and a block from the house it dieseled and died...won't restart.

My experience of replacing three liftime warranty distributors on the same Honda ended after purchasing a brand new distributor on Ebay for less $ and without the rediculouse core charge on rebuilt distributors. I see new Altima distributors listed at $139.50. Computer controlled engines are designed to get you home even if a sensor fails. Your engine should run with the knock sensor unplugged or sending a constant knock signal. It is important that ignition timing is set correctly to manufacturer's specs and instructions. Recheck the timing with the TPS unplugged. Minor errors in ignition timing can be compounded several times by the CPU due to innacurate timing input info. Make sure there isn't a problem with the cooling system thermostat being stuck open or missing. Intermittent problems are frustrating when electrical parts are effected by temperture increase caused by closing the hood and driving down the street. Excessive crankcase pressure could cause oil to be pushed into the distributor, possibly from a restricted PCV valve or hose.