I have a 99 and its had a SES code for a while now and its been getting progressivly worse. Misfire on #4 cylinder.I did the usual tune up which didnt help. I ran a compression check and all cylinders other than #4 were 170-180. #4 was 125. I shot some oil in the cylinder and tried it again , didnt move much. Question is where/what should I look at first? It has 123K on it.