[SilverDC2]

I have a 01 GSR recently had the bottom end rebuilt, got the car back drove it for a couple of days then the CEL pops up. I check the code and actually get 2 codes a 67 and a 90. I called the shop and the mechanic has not got back to me yet, so that is why I am asking the question. What do these codes mean? :confused
Oh and it just started making a rattling noise, while I am idling
Any help would be appreciated, I don't wanna be dicked around by the shop, just want the car to run right
Thanks in advance

 

[Snoopy]

http://www.c-speedracing.com/faq/05.php

 

[acuradriva]

Its right in the stickies