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A new ECU temp sensor cured a hard-starting problem for me. Before I replaced the sensor, the car might try meekly to fire once, then forget it. (However, it would start readily with the gas pedal held to the floor, so this was more of an annoyance than real problem.) Seemed this happened only with a stone-cold engine at a temperature near freezing. I didn't check codes and decided to try the sensor after researching the matter here. Over three years later, I've had no such trouble since.
The part cost roughly $15 at O'Reilly Auto Parts (as I recall they had it for me within 24 hours) and it's easy to replace with a deep-well socket. Could be worth a shot.
dcb
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