in particular, check that the 2 black wires [that looks like a ground, and is attached to the exhaust manifold studs with what looks like an eye lug, this is actually a thermal resistor] for the ecu's temp sensor has not had any thing tied into it, I have seen times when people thought that it was a ground lead and tied some added device into the wires, one of these wires is connected to the black and white wire going back (coming out of) the ECU, that is common to both the temp sender for the ECU (not the dash gauge, it has it's own temp sender) and the accel. pedal position sensor.