That sounds like an ignition problem then..... What does your spark look like when you test it?

 

 

Think I would be tempted to check compression on the rest of the cylinders.......

 

How many miles are on this truck?

The compression numbers and the fact that you said that it was chugging really bad makes me wonder if maybe you're timing didn't jump a tooth.

 

 

 

Nope. It really depends on what the numbers look like. Even if all cylinders are around 100 PSI, it should still run.

You have good spark, you have good fuel pressure, the injectors are firing. Everything seems to be working as it should.... but, it still doesn't want to run worth beans.

Given that we had a couple threads with similar problems, and were traced back to bad gas..... Might be interesting to pull the fuel line off the at the rail, and collect some fuel in a glass jar..... Set it on a shelf for 10 minutes or so, and see what it looks like.

 

Under the heading of...if you eliminate the impossible, whatever's left , however improbable, must be the answer. Even at around 100 psi, the engine should run. If you checked the rotor position with the cap off against the timing mark on the harmonic balancer and they're even close, then I'd say you're good on valve timing. Have you checked to see if your getting exhaust flow yet. If the exhaust is completely plugged and the sparkplugs are fouling, then it might take more than just a O2 sensor removal to provide enough exhaust flow. Unless your exhaust pipe to manifold bolts are "welded" together, loosen them so that the pipe hangs loose on the manifold n try to fire her up.
You might also try a bleed down compression test ( get a bleed down testor at this point. Also, lend an ear at the throttle body with the butterflys open, at the exhaust pipe outlet and at the oil cap, removed of course. At 100psi on your cylinders, you should expect some hissing, but if it's excessive... However, you could also remove your valve covers and see if the valve train is moving like it should. Many times, a simple compression test won't tell you about things like, bent push rods, stuck or burnt valves, collapsed lifters...etc.

 

I had hoped you would chime in on that. The timing chain suggestion was just a shot in the dark but you are absolutely right.. Bad gas is a very likely possibility. Especially if the stores in his area are running too low and they're pulling gas from the bottom of the tank. It would likely clog the filters in the pumps first. Water should be detected by the system but that also depends on the store's system and the store owner. There are a few stores here in Central Texas that will run theirs extremely low to get that extra buck or risk pumping water.

Source: Brother-in-law fixes fuel pump issues at gas stations and I like to ask questions.