I have this idle problem where I would start my car and it would idle funny. I would look at my boost gauge and it would read 16-17 hg-vac and the car would shake. rpm would be around 900 to 1100. after a minute or two the problem would go away and it would idle fine. idle would be lumpy, lumpy, lumpy and then smooth. Thats the only way I can describe it. This use to happen when ever I left the car sitting for more than 2 days without starting it but now its happening almost every day. Is it because the oil is so thick? I'm using 15w-50 mobile one. I have a code 11 also but I don't know if that is related.