I have a '91 Blazer (TBI350/SM465/4.11/33" BFG)that has a wandering idle . I suspect it is a vacuum leak, but I can't find it. I have thrown every sensor in the book at it, replaced the intake and throttle body gaskets, replaced all the vacuum hoses, etc. I finally bought an AutoXray to narrow down my search. I ran the following test at 20mph, 2nd gear, in closed loop. I was wonering if someone could help me figure out if these numbers are within range: Idle air Mtr Pos-67 steps Coollant temp: 181.4 MAP sensor: 1.17 volts Engine RPM: 1375 Throttle sensor: 0.76 volts Integrator: 125 Oxygen sensor: 79 mVolts Battery Voltage: 13.6 Voltz Knock Sensor: 28 Block Learn: 114 o2 cross counts: 132 Clear Flood Mode: off Learn Control: enabled Rich Lean Flag: lean Loop Status: closed Air Switch Solenoid: off Air Divert Soleniod: off Battery Voltage Low: no Async Mode: off Can someone give me a hand in decoding this data? Thanks a bunch.