Misfire after head replace

[blue62]

Your RKAT's as per post #3...... I read as a -1.4 and a .8

Coolant in the Cat's will destroy them rather quickly.
A plugged up cat could cause your issue.
So I will tell you how to test the cats for restrictions with the vacuum gauge.

AFTER YOU DO THE "IDLE" VACUUM TEST.

Take the RPM up to 2000-2500 hold it as steady as you can.
Hold that RPM for 1 and a half to two full minutes.
Watch the needle on the gauge if it slowly falls over time your cats are plugging up.


I forgot to mention:
Very important... make sure your A/C, heater, lights, radio are off when you do the tests.

you can use your Durametric to see if the Cats are "Catalyzing" (working) correctly by observing pre and post cats O2 sensor signals under the right conditions.

I can describe how to do that for you but lets see what the vacuum tests have to say first.

Make sure you hook the vacuum gauge up and run the tests the way I described, or the tests will be meaningless.