I got a SCI cable and MPscan setup and everything working (I think) but hadn't done any data logging until a couple days later when my car (87 Shelby Lancer) started idling extremely lean and miss firing, if moving and it builds boost it richens up and stops miss firing. Its not throwing any codes but the VSPD gauge in MPscan always shows 0 MPH and the AFR is stuck at 8.0:1 even though my wide band is reading correctly. Should I blame the VSS? Or is there something in MPscan I'm missing and I should continue looking for whats causing the extremely lean issue?