This is the story. I Bout a 99 Malibu on March 30. And about a month later or so i ran it out of gas. Did fine. Ran it out of gas Again maybe a month and half later after the first time. It was fine at first but later on started running weird. When you would start it the first time it would just drop to 200 rpms then die. Restart after and it would drop too 200 rpms and then jump up and idle fine. I Replaced the Mass Air Flow Sensor. It fixed it. But now when its just idling in Park or Neutral Sounds like the motor is Misfiring. The RPM Gauge does not drop or move when idling. Its stays at 500-600 rpms. But just sounds like its misfiring. But when you put it in DRIVE and you have your foot on the brake it will smooth out on the motor. But realized when i was at a red light it felt like i could feel it misfiring. So i took it to a shop and the Mechanic said he had his computer monitor it and he said Cylinder 3 and 4 are misfiring. But before i took it too him the Wires. Plugs. Coil packs and Ignition module was replaced. He said 3 and 4 where jumping on his computer. So far i replaced allot of parts. And nothing has changed the idle. What could this be? Injectors where Replaced with used ones but it still runs the same way. The new injectors where sea foamed. Also when i ran sea foam thru the Brake booster line and took it for a drive and pop the hood while idling the motor was sounding great! But since that night back to the old ways. Also when i was looking at the motor today right bye the top of the tranny and on the right side lower part was some kind of Liquid. What could that be? It ain't gas. Thank you!!!