Your question is comparable to asking " I want to go to on vacation, where is it and how much will it cost" Be Clear.
The idle sensor on a 1991 S10 4.3 can be located at the engine bay.
No crank sensor, only the sensor in the distributor.
It is located inside of the distributor.
they are located on the exhaust manifolds
the camshsft sensor is located under the water pump.you can`t see it,you have to feel for it
That year did not have a MAF sensor / Mass air flow sensor.
That car does not use a maf sensor.
The sensor is on the driver side of the head. It has a single wire to it.
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.
The map sensor for the 1991 Acura Legend is mounted on the firewall. It is in a box near the factory strut brace.
If it has a 4.3L engine the temp sensor is located next to the thermostat housing.
the o2 sensor is located on the exaust manifold