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What would cause all windows not to roll down and the need gas service engine light come on after starting a 1994 Pontiac Transport but worked again next restart?

Several factors could cause all windows not to roll down and the need gas service engine light to come on in a 1994 Pontiac Transport. Here are some possible reasons why these issues occurred and why they might have resolved themselves upon the next restart:

1. Electrical System Issues:

- Faulty Power Window Switches or Wiring: If the power window switches or their associated wiring have problems, it could prevent all windows from rolling down simultaneously.

- Electrical Short-Circuit: A temporary short-circuit in the electrical system could cause various electrical components, including the power windows and engine sensors, to malfunction. Restarting the vehicle might have reset the system and resolved the issue.

2. Engine Management System Issues:

- Temporary Sensor Glitch: The "need gas service" engine light is typically associated with a problem in the vehicle's engine management system. A temporary glitch or sensor malfunction could trigger the light, but restarting the vehicle might have corrected the issue.

- Fuel System Problems: If there was a brief fuel supply issue or a temporary malfunction in the fuel system, it could cause the engine light to come on. Restarting the vehicle might have allowed the system to reset and resolve the problem.

3. Computer Module Issues:

- Computer Module Reset: In some cases, the vehicle's computer module (Powertrain Control Module or PCM) might experience a temporary malfunction or software glitch. Restarting the vehicle can reset the computer and potentially resolve the issues related to the windows and the engine light.

4. Battery or Power Issues:

- Low Battery Voltage: If the vehicle's battery voltage dropped temporarily due to a weak battery or loose connection, it could affect the proper functioning of various electrical systems, including the windows and engine sensors. Restarting the vehicle might have restored sufficient voltage and resolved the issues.

If these problems persist or recur frequently, it's recommended to have a qualified mechanic inspect the vehicle's electrical system, engine management system, and any relevant sensors to identify and address the underlying causes.