1992 5L RS, MAF or MAP

My 92 305 RS is throwing out a code 23. Which haynes state is the Mass Air Flow Sensor code. So, I tried to find a new one, but the parts stores all say "Not Available". They do have MAP sensors, and I read somewhere that they changed to MAP sensors for TPI engines in 1990.
Also fbodymotorsports.com only seem to sell MAP sensors for 1990+ vehicles.
Does anyone know whether the 5.0L RS uses MAF or MAP???
I am so confused.

Normally when the parts stores say NOT AVAILABLE it means it’s a Dealer only part... Call you local Chevy Parts Dealer and see what they say...

Yea 1990 was the year of change to MAP sensors. Just look in front of your throttle body. Is there a MAF sensor hooked in between the rubber boot and the dual snorkel piece that hooks upto the air filters??

well, if its a 5.0L RS, its a TBI engine, i know there is a MAP sensor under the air cleaner i think??? crap cant remember, and i know built into the air cleaner there is a sensor that has an electrical connector, but i think its an air temp sensor. If im correct it is a MAP sensor on the TBI engines, and if i remember right its on the firewall, behind the intake.

You have both a MAP and MAT/IAT sensor. The Map sensor should be located on the passenger side of the firewall (by the AC). It should have a black, light green and gray wire going to it. That is where mine is located and I have a 92 RS as well. The MAT (IAT on newer models) is located in the stock air cleaner and it should have a tan and a black wire going to it.. This sensor measures the air temp going into the TBI.

Here is a link to a a vendor for the MAP sensor.
http://www.autozone.com/servlet/UiBroker?UseCase=C001&UserAction=performSearch&Parameters=Auto+Store%7C%7EREGULAR+PARTS+LOOK+UP%7 C%7EM.A.P.+SENSOR

Just copy and past it.

Phil

Sorry forgot to add that only MPFI V6 and TPI V8 models use the MAF sensor.