Recall 2005 Chev Colorado 2.8L and 3.5L
Maybe I should call it a "tentative" recall.
For the above engines: "...may experience a condition where the engine intake vale seats may wear." This is normal, but: "This will cause partial misfire and illumination of the Service Engine Soon light."
Goes on to say: "Do not take your vehicle... as a result of this letter unless you believe that your vehicle has the condition as described above."
Now I can say my 2.8L isn't the smoothest engine I've ever sat behind, but the Service Engine Soon Light, has not come on other than for oil change.
While GM has extended the warranty to 7 years for this problem, it seems to me that I should look for an excuse to have GM check my engine out. But I wonder, if there is some way for them to diagnose early intake valve wear without taking the head off, and doubt they will or should do that unless there is some indication of a problem. This is nearly identical to a post on MFT.