How could I test this??? Keep the suggestions coming I'm sure we'll figure it out eventually lol

 

First if youre experiencing a misfire and its been a descent amount of time since your last tuneup id suggest you do the basics first and go from there.

As for your O/R x pipe you either have to tune for it by way of a hendheld or buy MIL connectors.The car will NOT relearn.Its an emissions fail according to the computer and it throws a code or CEL.The predator i thought could tune for that i know my SCT does.

 

You have to back probe the wires and using a DVOM you do a full sweep of the TPS using the throttle plate.All youre looking for is flat spots throughout the sweep from idle to full throttle.

 

well I put my predator back on yesterday and re-installed the tune which turns off the rear 02 sensors and cleared the code and today it came back.. the code is
p0420 and p0430 (i think) and says Catalyst efficiency low on bank 1 and 2... why is this happening when the o2's are supposed to be off??? does this have anything to do with my missing problem???

 

well if you're getting those codes then your rear 02's probably aren't off, how many miles do you have on your car?

 

about 91k... don't the rear o2's turn off with the predator when the performance tune is installed? I haven't seen anywhere in the menu where I can turn them off.

 

have the plugs ever been changed? if not, that's something i would do since it's cheap and easy along with the fuel filter. i never used a predator, but i'm sure there's an option to turn off the rear o2's