My car does fine until the engine warms up, and then that's when the problem starts. After the engine warmed up, I sat there and watched the RPM's go from 800 , drop suddenly to 200, then rebound immediately back to 800. The engine holds the RPM's just fine for a few seconds then RPM's drop fast again and rise just as fast. It will do that RPM dropping/rising a few times, then the next time it starts to do it, the car dies.
What makes this problem better or worse?
problem only happens when engine reached operating temp.
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Hello, when the engine "warms up" it goes into "closed loop" -- meaning starts relying on information provided by sensors and other inputs. To me, it sounds like there is air getting into the engine that the processor cannot cope with well enough in an effort to keep fuel and spark sufficient in relation to the air. Seek out vacuum leaks, hoses disconnected, things of that nature.
