Did you do a compression test

A trick i used to use to test the Cat was to remove the O-ring from compression tester and screw it into the cat. I think that normal back pressure was about 10-12psi.

I did one a few months ago that came back normal. I was thinking of doing another, but decided against it due to the fact that the issue is affecting all of the cylinders.

I don't know anything about the specific model or the mods but it might be a timing issue.

I thought of that too, but it has a timing chain rather than belt. I'm not entirely sure if that eliminates the possibility of an issue or not.

They can go bad too. Not sure I've seen one go bad that hasn't broke and tore the hell out of everything while it gets wound up.

Jason is a better guy to ask than me.

If it's getting every cylinder it could be timing or a controller problem IMO. But I run Deere shit so I may be abnormally predisposed to controller problems.

I am getting a P0102 code on my 02 Monte Carlo. The MAF sensor has been replaced and I have used a multimeter to confirm power to the MAF Sensor connection wire. What else could the problem be?

Sounds like a vacuum leak somewhere.

EDIT: sounds like others have given that suggestion as well. Shouldn't be too difficult to do yourself.

Brand new equipment is covered by the Deere warranty. I know you don't run anything older than a couple years.

ROFL

Riiiiiiiiiiiiiiiiiiiight

Did you do a wet dry compression test Leak down if anything looks iffy..

Since you are thinking T Chain:

You can check chain by pulling V\C and doing 2 things. Rotate the engine to where the 2 timing marks align between the 2 can gears and then align the yellow links to the top. Now look at the yellow links, they should be centered with a slot on right and a dot on left sprocket.
You can now check for tension on the chain between the sprockets and you can also see the the # 1 cylinder should be in TDC (valves closed) Now would be a great time to check valve clearances too.

I doubt you will find anything as Yota chains are bulletproof.

I have never seen a yota chain brake (belt sure) but they never get wrapped around anything, either belt or chain, they just fall to the side. Old 22r and Re's would get loose and the chain would cut into the cooling jackets and flood the crank with antifreeze. Catch it too late and it takes the bearings out. I have rarely seen tensioners break (wear out sure) but if you're that far along you are replacing them anyway.

What Yota runs a Deere engine anyway

It's a GM product?

Not car. Sprayer, tractors, combine.

Sounds as though your fuel is watered down , you gotta get some into a cup so you can take a swig to see if you can taste any water.

Assuming you probably did if you checked the coils, but did you also check the ignition module?