I have a 2000 and it will not start. i have changed the distributor the rotor butten the cap the wires and plugs camshaft sensor the cranckshaft senor the MAF and i have plenty of fuel in it. any suggestions?

 

Do you smell fuel at the intake with the cover removed?

Are you sure your plugs are sparking?

Those two things jump immediately to mind.

 

What made you go through all of that work? Were there any codes? Have you tested fuel pressure?

 

i have been having problems for a few months and some things were changed for maintance others were because of the codes. i do not smell fuel from intake.. one code i have now is p0420 annd i think another one was p0120,

 

check fuel pressure and ignition timing?

 

P0120 - Throttle Position [TP] Sensor Circuit
P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

I would handle the throttle position code first. Check out the other TPS codes in the OBDII Code Index link in my signature for a wiring diagram and check out the wires as well as do a functional test on the TPS sensor. By back probing the sensor return wire with the ignition on, you should see ~0.5V at idle and ~4.5V at wide open throttle. The reference line should have +5V and there should be a ground. If either of these two are missing, the TPS sensor will not be feeding the proper information to the PCM.

You can also run down through the P0420 link I provided and see if anything jumps out at you.

But I would definitely test the fuel pressure. Fuel pressure problems are well known with these trucks.