2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark

all misfires and bad mixture of fuel and air

https://www.google.com/search?q=05+TAURUS+CODE+SHOWING+po171+po174+po300+pO303+pO304

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Do tune up,coils module,wires,plugs and see what happened..

If a tune up (spark plugs, ignition wires, distributor cap/rotor button or coil packs) don't work, try checking the fuel system.

We can't help you here

You need the car diagnosed

I doubt you have lifters,should have
OHC valve train

Most likely the oil passages are clogged up
in the cams with sludge

That's what happens when the wrong oil
& too long between changes takes place

You ruin the engine

1-2-3-4 Pass Side

5-6-7-8 Driver Side


1&5 are at front by radiator

PO304
PO305
PO306

COP Cylinder Misfire Codes

May have to walk a new coil --as they
may not be as the code indicates

Rock Auto.Com for coils

Get Airtex Coils

Install one piece Champion Plugs 7989

Loose the front ( 2) O2 Sensors after 100,000 miles

Clean MAF Sensor--CRC MAF Cleaner

Do not use old coils or swap coils or injectors

Questions just ask

If the car is an automatic change the gearbox oil .

this is an obd2 code trouble table, it can help you understand the meaning of code.
for p0300, you can go here.
for p0303,you can go here.
for p0304,you can go here.
for p0134, you can go here.
for p0341, you can go here.
hope help.

The 300 codes are misfire codes, do a tune up and that should fix the problem. the 155 i will have to investigate and try to see what it is.

Can be many things. Have the ECU scanned with an OBD2 scan tool. This tool will retrieve the code that has been set and the code will indicate what part is being effected. With that code you can start to diagnose the problem. Most auto parts stores will scan it for free.

the po303 and p0305 codes are indicating a cylinder 3 & 5 MISFIRE respectively. the other codes are for o2 sensor and fuel trim. the misfire codes should be fixed first and then worry about the others if they still exist. if the vehicle has direct ignition or coil on plug, this is a good place to start, the ignition coils for those cylinders. a scanner with a misfire monitor would really help to narrow done the problem and as always a tune-up never hurts if it hasn't been done for some time or plugs, air filter, etc, show signs of deterioration. the misfire codes if left untreated will release raw hydrocarbon emissions into the environment not to mention the damage it could cause to your catalytic converter due to overheating. also your gas mileage will suffer. hope this will help yoy