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Don:
On reflection I totally agree: the ECT operates at high (like 10k ohms+) at very cold temperature and low (200 ohms) at operating temperatures. I missed the new harness note: that would mean that wiring harness rot (touching or grounded wires) can't be the problem. It could mean, though, that a connector was not correctly hooked up in the ECT circuit when the harness was installed. Bad sensor might be the issue: Tony can check it quickly by (1) checking the reference voltage at terminal 1 on the connector (as you look at it, the right-hand terminal when the connector lock is on top) when the ignition is on: it should be around 5 volts compared to ground and (2) checking the ECT itself by turning the ignition off and testing the ECT resistance at the right-hand terminal as you face the sensor, compared with ground. At cold temperatures (say around 30 degrees F) this resistance should be around 6k ohms; at operating temperature (212 F) the resistance should be around 200 ohms. If the reference voltage is not correct across the range then there is a wiring, connector or ECU problem. If the sensor resistance is not OK then Tony should try a new sensor. He should also check the Throttle Position Sensor and make sure it "clicks" when the throttle plate is just opened (it could be mal-adjusted). If these don't fix the problem then it could be a fuel pressure issue.
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