I have a 1998 volvo s70 with a 2.4 non turbo and i have replaced the wires coil sparkplugs the head gasket and i am still geting misfire codes for all cylinders and it has the IAC code up to and random cylinder misfire code at a idel the cars rpms keep going up and down and the hole car shakes but after you start driving it then it runs fine untel you are at a stop light it runs bad agin untell you start driving agin i realy need some help with this car i am due to have my first son july 31st and i want to make sure i have a good running car so we are not broke down on the side of the road what could the problem be

 

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