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I was experienceing similar troubles. mine turned out to be the coolant temperature sensor. my car started fine when cold but once warmed up flooded itself. the test is easy. access the ECU in the passenger's side kick pannel in the car. remove the harness plug and the screw that holds in the "plug board" to the "plug clip" then connect an ohm metter between terminal #2 and ground. If i recall the reading at 85 degrees F should be about 1400ohms. resistance should increase as temp drops and decrease as temp increases (it is a termo-resistor) If yours is like mine (aka screwed up) you will get a differing result. if you get a reading that is incorrect next perform the same test at the sensor itself (it is in the head and a pain to get at...I had to remove my intake manifold) if this reading is correct now you know the sesor is good and that their is a wiring problem. If the reading is incorrect your sensor is toast...$15-$20 to replace. Mine was simply not plugged in all the way. if the wiring is the suspected culpret you can test the harness. if you pull back the rubber seal on the plug for the sensor you will see that the 2 wires are colored and numbered. I remember the wire that goes to the ECU is blue and the other goes to ground (i think its black). an easy test for good ground is to connect a test light to the pos terminal of the patery and the other end of it to the ground terminal on the sensor plug...if it is properly grounded the test light should light up...if not their is the prob. If that is ok next test resistance of the blue wire which leads to the ecu. Again use an ohm meter to measure at terminal 2 on the ecu plug and the other end at the blue wire on the sensor plug...the reading should be 0 + or - a tiny bit depending on how sensitive you meter is (wires themselves have a bit of resistance).....if there is greater resistance then chase down the source and correct. hope this helps.