bought my 93' R32 GTS25 with 96000 kms on it. had it for about a year and half and now its just under 120000 kms. When I first bought it, tail shaft Centre bearing and one fuel injector had to be replaced. Bushes were changed at around 110k kms. Now, the car is misfiring when both idling and driving (been happening since around 112000 kms) and when this does happen, he car tends to shake. Is it the spark plygs that need changing? Actually, does any1 know what this exactly is?