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What causes 1989 Chevrolet to stall when turning?

Fuel Filter Clogged: A clogged fuel filter can starve the engine of fuel, causing it to stall, especially when making a turn. The increased demand for fuel during a turn can overwhelm the restricted flow through the clogged filter.

Fuel Pump Failure: A faulty fuel pump may not provide sufficient pressure to deliver fuel to the engine. When turning, the change in fuel flow dynamics can exacerbate the problem, leading to engine stalling.

Idle Air Control (IAC) Valve Malfunction: The IAC valve regulates the amount of air bypassing the throttle plate, ensuring a steady idle. A faulty IAC valve may fail to adjust airflow properly, resulting in engine stalling when the vehicle encounters increased load or changes in engine RPM, such as during a turn.

Vacuum Leak: A vacuum leak can disrupt the delicate balance of air and fuel mixture entering the engine. When turning, the flexing of hoses or components may worsen the leak, causing the engine to stall.

Faulty Throttle Position Sensor (TPS): The TPS relays information about the throttle plate's position to the engine control unit (ECU). A faulty TPS can provide incorrect data, confusing the ECU about the engine's fuel and air requirements, potentially leading to engine stalling during turns.

Check Engine Light: If you notice the "check engine" light on your dashboard, it's essential to have it diagnosed by a professional mechanic. The onboard diagnostic system may provide valuable information about the cause of the stalling issue.