Replaced:plugs,wiresdistributor,fuel pump.truck wouldn't start before but now it starts but i am getting po135,po141,po147.po300 codes

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Sadly people don't know that trouble codes only tell the mechanic what to test, not what to replace. And auto parts stores are in the business of selling parts, not giving advice.
Code 135 means there is a problem with the heater inside the o2 sensor for bank one in front of the catalytic converter. Code 141 means the same thing for the o2 sensor after the cat.
Since it is very rare to have two O2 sensors fail at the same time, chances are the problem is lack of power going to the sensors.
The power circuits would need to be checked which requires a shop manual to get the testing procedures and wiring diagrams.

Yes. If the O2 sensor is faulty, it can tell the computer the fuel mixture is too rich when in fact is is too lean.

Well all three codes are for a problem with the heater circuit for the O2 sensors. And since all three sensors are not going to fail at the same time, I would assume the problem is in the wiring or the source of power for the heaters.
You'll have to find someone with a shop manual or buy a used one online to get the testing procedures.
The sensors each have a heater to allow them to start reading exhaust gas as soon as you start the engine.

Is there an illuminated check engine light on the dash? That sounds like a failing TPS (throttle position sensor). Unless you have low fuel pressure! When (if ever) have you replaced the fuel pump and/or fuel filter? Are you running the correct type of fuel in the engine? If you have slow or sticky fuel injectors, a can of Seafoam might help!

po300 is Random/Multiple Cylinder Misfire Detected.This means the PCM sees misfires on more than one cylinder,so it's probably a fuel issue.You might have a bad fuel pump(bearings are binding,causing low fuel volume).It could be the in-tank filter is plugged up,or maybe the in-line filter.Start with the easiest-the in-line filter.

Your alternator might be bad also, or the crank sensor

Hello your po135 is o2 sensor bank 1 your po141 is O2 sensor bank 1 sensor 2 and your pO300 is random multiple cylinder misfire these problems are your oxygen sensors and engine misfire pO300 is you engine missing o2 sensors are switches in the exhaust system the engine misfires are the engines cylinders missing.

Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0300 - Random/Multiple Cylinder Misfire Detected

Hi Sandra!
The trouble codes listed are defined as:

P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

P0300 Random/Multiple Cylinder Misfire Detected

P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)

PO300 & PO331 are possibly symptomatic of issues caused by PO141, which would have a direct influence on the air/fuel mxture... which could cause missing and knocking.

So the first thing I would try is replacing the Bank 2 Oxygen Sensor, after making sure the wiring and connections to that sensor are in good shape.

Does the engine show any physical issues such as loosing coolant, smoking exhaust, overheating? A blown or leaking head gasket on the #2 bank could also present these (among other)
codes.

Good luck and let me know how it goes!

WB