New to this forum! I’ve got some questions as far as MAP sensor readings go, I’ve got a 90’ on mspnp2 car was professional dyno tuned a few years back, ran great for a few months then noticed it was starting to lean out gradually over time, noticed today that the MAP sensor is reading 70.1 at key on. Looked back at some old data logs to compare and seen it was in the 90s kpa. Could the internal MAP sensor be causing this issue?

 

Yes. Either the sensor has failed, is not getting the correct voltage or ground, or the wrong sensor is selected in Tuner Studio. With the car off the kPa should be around 100 at sea level. 90 sounds right at 3000ft elevation. See chart (elevation is in meters).