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Hi All, We purchased a 2011 FG XR6 last year through a Ford dealership in Brissy (had 22000kms on the odo). When my missus took it for a test drive she drove it out of the dealership and got out on the road, pulled up at the first set of lights and whilst in Drive with foot on the brake the idle went very rough to the point it would almost stall. She spoke to the salesman sitting beside her that there is something wrong with this car and that she didn't want this one. He stated the normal 'well fix that, it won't be a problem'. The missus was ok with this. Took delivery of the car and this time I was with her. I drove the car out of the dealership and it done the same thing at the same set of lights. I took the car straight back and told them there was a problem with it and booked it in. Diagnosis was low volts code came up so they put a new battery in it. Within a week it done it again. Took it to another dealership....couldn't find the fault and no codes. Spoke to the dealership and they said it just needs a good drive with good fuel! Our cars have run only on BP ultimate or 95 and it still has the same fault. I drove the car from Brisbane to Perth (to give it a good run) and it is still doing it. After 2 months of its last visit to a dealership I took the car to the nearest Ford dealership here in Perth and they couldn't find a fault or get it to run rough on cold start or under normal conditions. Took it to another dealership and they finally found that there was a problem with the car. Thoughout this process I have the CRC involved in our case and the dealership we are dealing with now have been very patient and trying everything to find out what it is. We carried out a carbon clean, replaced coil packs, checked PCV valve, checked all vacuum lines for leaks, all sensors checked, inlet manifold removed, had all the injectors flow tested, checked timing gears and tone wheel to see if a tooth has broken and timing chain has skipped a tooth, checked solenoids to see if they were gunked up, identified it's not a bodgy diaphram in the brake booster as it only does it now and then!! The dealership has no other option but to remove the head to see if there is a sticky valve or problem with it seating however Ford CRC have advised me that they "don't pay for the removal of the head".....so I have to wear the cost of $1800 to remove the head...all of which will not guarantee we will find the issue. I am at wits end with this. I am in the position that we shouldn't have to pay for anything as the car was defective from the day we purchased it. The warranty ran out in July 2014 however the car has been in the shop and had the case open prior to the warranty running out so it is still covered for this problem. Most occassions the car runs beautiful, it is regularly serviced, never thrashed hard and is the 3rd FG we have owned. Admittedly it is the 1st n/a XR6 we have owned as the last one was a FG XR6T ute which ran flawlessly. Has anyone had the same issue with intermittent rough idle and had it fixed??? Cheers Tim