AAC & rough idle posted by cameron40420 on June 17, 2008 at 04:56 PM
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AAC can cause low or high idle. Since this happened right after replacing an injector I would check that first ( the injector that you replaced). It is very easy to pinch an o ring during an injector install. If it is pinched, or not properly seated it will leak and one cylinder will be super rich. This will cause the other cylinders on that bank to be super lean. Pull the spark plug for that cylinder and see if it is wet. If so, then change the injector o rings. After checking these items you will have to find that vacuum leak. Go to the FAQ pages and search for idle issues. I believe that the test is refered to as a boost leak test. While there, find the write up on the 6 p's. With these tools you should be able to identify your issue. Hope this helps. Good luck.
