03 Range Rover HSE 4.4L
 

Can anyone help? Ive had nothing but problems with my rover :( and now it idles really rough and vibrates when driving. The hubs hooked up his OBD2 reader and it is throwing the following codes
P1300, Misfire codes 303, 305,307 and then 1173
Any ideas will be great as my local mechanic just shut his doors (today) for good.
Thanks in advance for your help

P1300 Random Misfire, P0303-7 Cylinder 3-7 Misfire Detected. P1773 Automatic Transaxle. How many miles do you have on it? When was the last time you changed your spark plugs and wires. When was the last time your transmission was serviced?

She's got 111540 miles. I had to have the transmission rebuilt so its basically new as of a year ago. My husband chand all the spark plugs (after this started) but not the wires and that's been done within the last 3 months. I've also replaced drive shaft, front passanger side shock, Gaskets on top of engine, replaced water pump, and I'm sure some other stuff that I can't recall. I'm stuck with this car so I have to figure it out :(

The spark plug wires can cause this as well. I would go get a new OEM set of them. It needs new plugs regardless of whether or not they are the problem. My experience is limited with the Mark IIIs, but if this were my rover, I would suspect bad ignition coils. How long have you been running your engine with the problem? The reason I ask, is the BMW ECU in your rover will need to have its adaptations reset and possibly need to go through the relearning process which can only be done with the correct equipment (at the dealer usually). Your engine is throwing out a transmission issue code, so I would check the fluid level so you don't find out it was low after a few gears come exploding out of it.

03-05 range rover's with the 4.4L bmw engines use a coil on plug system. No plug wires. It may just need a good fuel injection service.