Hello everyone. I am a newbie and have a problem driving me up the wall. My 2004.5 S40 has been perfect until a couple of weeks ago when after spark plug change the car started going crazy. I have no lights on my dash idling is on point but with just normal depression of the accelerator pedal the engine revs spike then after a light delay the car responds. Sometimes during normal highway driving the engine revs go up like an automatic vehicle changing gear. Cruise control sometimes disengages immediately when set and when i do acti vate and try and return to set speed it fails always. I have changed the spark plugs am on my third set i also have cganged the air filter and çleaned the MAF with MAF cleaner. Any help would be greatly appreciated. I hope I have explained myself well enough. Àpologies for the long post its just that this has me pulling my hairs.
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