Mitubishi galant misfire cylinder 3

code p0300 refers to random/multiple cylinder/s --misfire detected.===causes spark plug/s---HT lead/s---injector/s--ignition coil/s---low compression---wiring. NOTE--Injectors may also include low fuel pressure in the manifold

on thesae oldr cars 2 and 3 cylinder fire together same as 1 aND 4 ,without head under the bonnet i honestly couldnt tell you the answer but i might be inclined to suspect a valve not seating correctly all the time

yes start with your plugs and then the wires to see if it is the wire pull the cylinder 4 wire off and swap with another plug if it changes to another cylinder misfire then you know its the plug wire. hope this helps and good luck let me know if ya need more..

Usually, a randon cylinder misfire is caused by the igntion coil. I did not see in your question where you replaced this.

Sounds like either a bad plug or wire, replace both.

check moter and switch wichever is bad replace

It's probably not the spark plug. I would check the coil and injector. these two are the main cause of a single cylinder misfire. ps if the car is running fine now(not missing out) I would have the code erased and wait to see if it came back on.

Misfire means you need spark plugs replaced. Or spark plug coils.

That's why the whole car starts shaking because its running basically on 3 cylinders and not 4 as supposed. There is no gas compression on the 3rd cylinder because once again the spark plug is "misfiring"

There also might be even a bigger problem which could be the distributor cap where the coils are connecting outside the engine.
once you fix the problem the check engine will turn off immediately

hope that helps.

CODE 27 - Injector Control Circuit, output driver does not respond properly to the control signal

Code 27 MIL light options: OBDII
P0201 - Injector #1 Control Circuit
P0202 - Injector #2 Control Circuit
P0203 - Injector #3 Control Circuit
P0204 - Injector #4 Control Circuit
P0205 - Injector #5 Control Circuit
P0206 - Injector #6 Control Circuit

CODE 43 - Cylinder Misfire, or Ignition Primary Circuit

CODE $# MIL options: OBDII
P0300 - Multiple Cylinder Misfire
P0301 - Cylinder #1 Misfire
P0302 - Cylinder #2 Misfire
P0303 - Cylinder #3 Misfire
P0304 - Cylinder #4 Misfire
P0305 - Cylinder #5 Misfire
P0306 - Cylinder #6 Misfire
P0351 - Ignition Coil #1 Primary Circuit
P0352 - Ignition Coil #2 Primary Circuit
P0353 - Ignition Coil #3 Primary Circuit

check fuel injectors, fuel pressure regulator, air filter. cat converter, O2 sensor. failure of any of these wastes fuel. air/fuel ratio should be normal.