I've had my 83 ZX for about 2-3 months now, and my FI problem is really getting old! I bought the car knowing it had a problem, but it's progressively gotten worse. The previous owner put the fuel pump on a switch. I don't know why, I didn't ask. Anyway, every now and then I'd go to crank the car, flip the switch on, turn it over and it would crank, but would run way too rich. Black smoke and smell of gas, so I flip the fuel pump switch off and it would idle normal for about 5-7 minutes and eventually run out of fuel. Then flip the switch on and it would run like a champ. How in the world it runs that long without the fuel pump on is beyond me! Anyway, that would happen maybe once a week. Now it happens about once a day! I can be driving down the road and all of the sudden I lose power and just pour black smoke out of the exhaust. I did a little test with the CHTS when it ran good: I unplugged it and it acted like it did when it ran bad, so I replaced the CHTS. Now with the new sensor in, it will never run right. It just sends way too much fuel. I'm looking into going to a carburetor now, but if someone can help me figure this out, I'd love to keep it like it is. My biggest thing is why it's just an intermittent problem...if it's a sensor, I would figure it would be bad all the time.