Where is the vacuum modulator on a 1986 Chevy 4.3?

On a 1986 Chevy 4.3L engine, the vacuum modulator is typically located on the transmission, specifically on the driver's side of the transmission case. It is connected to the engine's intake manifold via a vacuum hose. To access it, you may need to remove some components or hoses in the vicinity for better visibility. Always ensure the engine is off and cool before attempting any repairs.