I recently replaced the engine and everything north of the transmission. I didn't replace or rebuild the TBI or the fuel pump. The timing was set professionally by the specs. Once we did that it developed this surge at idle. It will bounce between 600 and 800 rpm until it warms up. My sense is that it has to do with fuel metering. What do you think it is?
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Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines.
The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced.
The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.