1997have a code p0300 have do i fix the problem

Po300 more than one code, What you have done, tune up, wires, plugs, fuel filter air filter.

the p0300--p0301-p0302=p0303 are misfire codes and can mean needs tune up or wiring problem and p0171 is system to lean bank 1 with this code if you correct it will probably correct the misfire codes your receiving
http://www.obd-codes.com/p0171 Fixing Hesitating Car P0171 Code YouTube P0171 System Too Lean Bank 1

P0401 is EGR problem
P0300 is a cylinder 3 misfire.
Replace EGR valve and do a full tune-up.

I think that you have a typo and believe that you meant p0300.
If so p0300 means multiple cylinder misfire.

A tune up will usually fix this problem.
spark plugs
wires
ignition rotor ( if it has one )
distributor cap ( if it has one )
Ignition coil
pcv valve.

Check your tune up.

A P0300 code is set when cylinder number three is misfiring. On this case the check engine light will probably be flashing when you are driving the vehicle. I would suspect that the wire to that cylinder is not on properly.

p0300 is a random engine misfire and p0420 is catalytic converter efficieny below threshhold bank1. one easily causes the other. only way to be sure you get it fixed would be a tune up, new cat converter and o2 sensors

p0300 is a random misfire, which usually indicates almost anything-generally a good tune up will fix it, like new wires, plugs, clean the throttle body, dist cap/rotor, check charging system, check fuel pressure, replace fuel filter...it is random (usually fuel) but a good going-over by a decent and honest mechanic will fix it.

P0300 is the random misfire code. P0301 is the misfire code for Cylinder #1. When was your last tune up? non platinum spark plugs should be replaced around 30-60k along with the wires. With platinum plugs that extends out to 100k. I would try a tune up first plugs and wires. Reasonably cheap fix that is a prevenitive maintenace item anyways. If you have just recently had a tune up or it does not solve your problem you most likely have a bad coil pack on cylinder#1.

Hope This Helps.

Zeppelinx12

not just a tune up or you want to fix misfire? need the diagnostic tool to determine the specific problem, if p0300 code appear, its not only spark plug and wire, cean the trottle body, iac, map, maf and the egr systems up to the fuel tank cap will be sure tight

Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.