O yeah it only started doing this ever since waiting in traffic, and the temperature gauge wasn't correct, cos the engine was defo hotter than what the gauge was saying, and the fan didn't kick in at all just thinking could it need a new C.T.S sensor
Yeah, if you get a decent quality set they will be numbered for what combustion chamber they go to.
They also vary in length.
The easiest way to replace them is to remove old number 1 lead, attach new number 1 lead, remove number 2, attach number 2 etc etc.
nope it's never over heated, I have looked into the possibilty that it could be that. Although the jumping started after waiting in slow moving traffic (because there was an accident) then when traffic speeded up, it started jumping bad like. It did heat up like but it didn't overheat, and this has carried on for about a month or two. Also It seems to only jump at high speeds and when the engine is warm (it's fine at cold).
everything about the car seems fine, no oil leaks, no coolant leaks, not burning oil, not going through petrol, nothings loose, no white stuff round oil cap or in that area, not loosing oil, car starts first time in any weather, orange light is off, changed the oil+filter, air filter, spark plugs, fuel filter 3k ago.
are you sure that they've cleaned it, resetting the engine ecu (PCM) can have a similar effect as it will drop the fuel/ignition settings back to the factory settings, after a while it will relearn how to drive and the fault may return. one thing i'd suggest is to take the egr valve off yourself and check that it has been cleaned or even removed (closest garage to me has a habit of not doing what they've been told, another reason i do everything myself)