Originally Posted by OhioRiverCigarette
The truck runs fine. Could the Black CPS be the fix?
It's very possible. @ 1st, most people thought that if a grey CPS threw off 1 injector, it would also have to throw off a corresponding injector. So if your #8 was failing a contrib test, it would also have to throw off #3. Now people are finding when they replace the grey CPS with just #8 failing with a black one, the #8 failure is fixed. Most grey CPSs are known for making the #8 failing on & off.