"What are the most common problems with the 1985 Camaro Z28's TPI engine?"

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The 1985 Chevrolet Camaro Z28's TPI engine is known for several common issues:

1. **Intake Manifold Cracks** (Vacuum Leaks): TPI's plastic manifold is prone to cracking, causing rough idle and misfires. Replace with a reinforced or metal manifold.
2. **Fuel Pressure Regulator Failures**: Leaks or corrosion disrupt fuel delivery, leading to rich/lean running. Test fuel pressure and replace the regulator if faulty.
3. **Throttle Position Sensor (TPS) Issues**: A worn TPS causes stalling or erratic idle. Replace and recalibrate the TPS.
4. **Idle Air Control (IAC) Valve Problems**: Carbon buildup leads to high idle or stalling. Clean or replace the IAC valve.
5. **Sensor Malfunctions (MAP/O2 Sensors)**: Faulty sensors throw off air-fuel ratios. Use a scan tool to check codes and test sensors.

For deeper troubleshooting, visit [ThirdGen.org](https://www.thirdgen.org/) or [CamaroZ28.com](https://www.camaroz28.com/). Would you like help finding parts or diagnostics?

1985 Chevrolet Camaro Z28

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1985 Chevrolet Camaro Z28

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