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On a 1999 Camaro, the map sensor is located on the back of the intake manifold. The intake manifold is the series of tubing that distributes the air coming into the engine.
The MAP sensor on an '86 Camaro with a 2.8 liter engine is located by the distributor at the rear of the intake plenum. There will be a black plastic casing that needs removed to gain access to the sensor.
The map sensor for the 1991 Acura Legend is mounted on the firewall. It is in a box near the factory strut brace.
The 91 has the 4.6L engine and has a MAF sensor located just after the air filter box so it has no MAP sensor.
It sounds like the MAP sensor is bad. Make sure there is no cracks or holes in the vacuum line and if it is fine, replace the MAP sensor.
its on the back of the intake, plugged into the top of an adapter looking thing
intake manifold vaccum leak
You did not specify as to the engine size. Generally they are located in the air tube from the air filter to the throttle plate.
Map sensors were not used on 88 camaros. Only maf sensors
I would suspect the map sensor is bad.
The map sensor on a 1991 cavalier is on the passenger side firewall towards the top.
where the map sensor on 98 blazer?