140k. The engine will get a hose down anyway, but if it was causing issues with coil, or even one bad cylinder, wouldn't it have thrown codes?
I don't think it was blowing back until I snugged up exhaust. That was also after seafoam. Ran for 5 mins after seafoam, let it cool a couple hours to get to exhaust, and then would not turn over and was blowing back. Leads me to think a massive cat failure, and now air can't move. When I'm back in a few days I might just take exhaust off at headers and see what happens.

 

Blowing air back through the intake is a classic symptom of an engine that is out of time. It is of corse sopposed to suck air through the intake. Worn out Timing Chain is my opinion based on the blowing comment ad the fact that it will not fire up now. The video on the other thread of this problem sounds like a metallic rattling sound to me. Slack in the chain. Now why it did not throw any codes is beyond me...

 

Look at the cats while its running. If the catalyst is clog the exhaust pipe will be red hot. Literally, it will glow red.

 

I'm assuming he can't do that based on the title of this thread.

 

A slacked timing chain wont make enough noise to be heard over everything else.
You need to confirm spark, then compression.
You can check the timing with a timing light, it does not need to be running for that, just a full battery and spark.
I assume you have been cranking the hell out of it trying to figure it out, you have not reported smelling gas, so you also need to confirm fuel at the engine.

Keep
It
Simple
Stupid

 

Yes, smelled fuel strong when first was cranking and not starting.

 

Check that timing. Process of elimination at this point. Haha