ok, I pulled the 02 sensor before the cat and no change. I swapped the 02 sensors from before and after the
cat and no change. Does any know what the average reading of the 02 sensor After the cat should be.
I am reading .1 to .8 volts on the sensor Before the cat and .02 after the cat is reading .15 volts with not variation.

another clue, when I disconnect the MAP sensor the missing is almost gone above 1000 RPM.
"Live from Chevelle's garage"

 

You cannot compare the O2 sensor readings from in front of the cat to behind the cat. Those values sound right. You also have another O2 sensor on the driver side.

What does the MAP sensor tip look like?

 

Yes, I knew they would be different really wasn't comparing them just want to verify the value of the
one behind the cat. The values on the other 2 look good. I haven't removed the MAP sensor will take
a look at it tomorrow.

Thank you.

 

The O2 sensor behind the cat has nothing to do with the engine. It is for emissions monitoring only.

 

I removed the MAP sensor and it looks grimey and strong smell of gas. Is there a something I can clean this with? Also is there a way to test it?

Thank you

 

There is specific cleaner for this - MAF sensor cleaner - available at parts places. Use the straw to focus the stream and clean everything.

As far as a way to test it, someone else will chime in.

 

I am looking for a cleaner for the "MAP" sensor.

 

Nothing special although I have never tried cleaning one before. I replaced mine on my old 2000 Bravada for something like $20 from an AC Delco retailer close by.

 

Supposedly you don't clean MAP sensors, you just replace them if they test bad.

 

How can you test them?