I have codes po300, po335, po760, and po765 for my2001 mitsubishi galant. what could it mean? i replaced my timing belt about 5-6 months ago. when i got it back the car wouldnt run right. it stall and buck sometimes when i would give it gas. i gave it back to the guy and he said it was the crankshaft sensor. i drove the car minimally andthe same problem came back. i replaced the spark plugs, wires and a camshaft sensor. i took it to another garage and they said it was a short in the wiring harness going to the crankshaft sensor and they said it was fixed. got the car back and within a week it was doing the same thing all over. and now it seems it is getting harder to start when it stalls. my buddy hooked up his code reader and these are the latest codes to come up.

Multiple cylinder missfire,ignition coil e primary/secondary circuit malfunction.shift solonoid c malfunction. i would think a timing belt being out of time would cause a multiple cylinder missfire, and since it was not acting up before i would suspect that maybee the belt was installed incorrectly. at the same time though a coil code and a transmission sol. code would indicate either two seperate new problems or a single new wireing problem.i dont have a wireing diagram for your car but there may be a common circuit for the coil and sol. that may be shorted or open.i would recomend the dealer for a repair you have returned it to the original shop with no satisfaction and another shop couldnt fix it either.

Sorry i cant be much here, this is not my specialty but here is what i can tell you.

Your first two codes deal with the ignition system or misfires.
P0300 Random/Multiple Cylinder Misfire Detected

P0335 Crankshaft Position Sensor A Circuit Malfunction

For P0300:
Symptoms:

the engine may be harder to start

the engine may stumble / stumble, and/or hesitate

other symptoms may also be present

Causes:

Faulty spark plugs or wires

Faulty coil (pack)

Faulty oxygen sensor(s)

Faulty fuel injector(s)

Burned exhaust valve

Faulty catalytic converter(s)

Stuck/blocked EGR valve / passages

Faulty camshaft position sensor

Defective computer

Possible Solutions:
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
For P0335:
Symptoms: any or all of the following:

Vehicle may not start (see above)

Vehicle may run rough or misfire

MIL illumination

Causes: any or all of the following:

• Damaged CKP sensor connector
• Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
• Sensor output open
• Sensor output shorted to ground
• Sensor output shorted to voltage
• Failed crank sensor
• Broken timing belt
• Failed PCM

Possible Solutions:

1. Using a scan tool, check if, when engine is running or cranking, that there is an RPM signal.
2. If there is no RPM reading, then visually inspect the crank sensor and connector for any damage and repair as necessary. If there is no visible damage, and you have access to a scope, you could check the CKP 5 Volt square wave pattern. If you do not, then, obtain a resistance reading of your crank sensor from a repair manual. (There are so many different types of crank sensors that there's no way to put here which resistance reading is correct). Then check the resistance of the CKP sensor by disconnecting the sensor and measuring resistance of the sensor. (It is best to check resistance readings from the PCM connector. This rules out any wiring problems from the start. But it does require some mechanical skill and shouldn't be performed if you\'re not familiar with automobile electrical systems). Is the sensor within resistance specs?
3. If not, replace the CKP sensor. If so, recheck resistance reading from the PCM connector. Is the reading still okay?
4. If not, repair open or short in the wiring to the crank sensor and re-check. If the reading is okay, the problem is intermittent or the PCM may be at fault. Try reconnecting and checking for RPM signal again. If there is now an RPM signal, wiggle test the wiring harness to try and induce the fault.

Your second two codes deal with your transmission

Sorry, i dont have any information on these.

P0760 Shift Solenoid C Malfunction

P0765 Shift Solenoid D Malfunction

If you need more help reference http://www.obd-codes.com/trouble_codes/ Where i got most of this information

Help this helps and the best of luck to you and your Galant

Multiple missfires,malfunction circuit a crank sensor,Shift solenoid c malfunction,and shift solenoid d malfunction.,,,Go back to basics,the timing belt is still not in time most likely.or,if the timing belt had broke on you,then there could be some bent valves in the engine.Pull the crankshaft sensor,and look on the end of it and see if there is metal sticking to the end of the sensor,if so,that is the problem,remove the metal,and change the oil,run a magnet in the oil pan drain hole ,and see if you can remove the bits of metal.