Hello- I have a 92 LX auto w/140k. It is all stock, only had recent tuneup (plugs/wires/oil/filter/tranny flush). I have only had the car 2 months and everything has been flawless till recently. Now this problem starts about 5 min after driving, as soon as I take my foot completly off the pedal it begins to make a deflating balloon sound for about 3-5 seconds then goes away (for exampl when I roll up to a stop sign or driving in traffic). If I leave my foot maybe 2% pressure on the pedal is does not do it, only the split second after taking my foot 100% off. It sounds like a bladder deflating or something (kinda like when you stretch a balloon and let the air creep out). Any suggestions? Im a little familiar with IAC's and stepper type motors but I dont know the system and whats related to negative acceleration/valves etc... Thanks in advance!!