1987 Shelby Z 2.2 one piece 555 stock exhaust manifold and turbo.
Idle is consistently between 1600 and 1900 RPM
Codes 12, 15
I've checked for vacuum leaks, disconnected all vacuum lines except for MAP and Brake Booster lines. The code 15 is new, it didn't show up til today. I noticed that the O2 sensor was throwing first lean too long and then rich too long so I went ahead and installed the LC1 I had. No 02 codes right now but my scanner shows the 02 voltage is 1.02 and doesn't change.
The code 15 is speed sensor and one of the triggers is the idle being more than 800 RPM higher. Is the SDS my problem or should I still look at maybe a leaky intake gasket? I've tested best I can for a leaky gasket but kinda over the problem at this point.