Runs rough, rich error, high fuel pressure

Update!

I got out my auto stethoscope and the tick seemed to come from the top end of the engine (lifter/valve, not rod). I hooked up a timing light and the flashes seemed in the same cadence as the tick (lifter/valve, not rod) with the engine running I pulled each plug independently, not change in the tick (lifter/valve, not rod). So that is all good, right?

I added some motor flush to the engine and let it idle for five minutes according to the directions. I then completed an oil change, with filter. Ticking still present.

If this is just a lifter tick, I would like to ignore it for now, assuming it will not cause much more wear in the meantime while solving the other issue.

The engine light still blinks after a short time started (fifteen to thirty seconds) it does not stay solid while the engine is running nor when I shut off the engine then restart it.

The computer is an OBD 1. I only have a basic OBD II Bluetooth scan tool, so that is no help.

Where do I go from here? Replacing parts and hoping will get expensive quickly.

I tried to pull codes but have been unable to do so using the pin jump method. I only have wires on the OBD in 2, 4, 5, 9, 13, 16. I looked at videos and forums online and have not found a way to jump this vehicle to read any codes. For instance, one video shows jumping 2 and 6 (but I do not have a 6), another says 3 and 4 (but I do not have a 3). You see the issue.

I have not been able to get to the truck in a few days. I tested for spark using my inductive timing light as near to the spark plugs, all wires had spark. The other night I went out and started the truck and looking for arcing. I did not see any around the plug wires, plugs nor the coil.

Getting to the lifters is definitely opening up more of the engine than I want to. Any other thoughts before I am left to that and hoping there are some bad ones in there?

Remove the valve cover and look for movement? Or lack thereof?

At this point, I do not want to admit defeat and sell it as is.

I pulled one cover off today (I did not have time to get to the other). Nothing apparently wrong. Only two rockers had minimal 'wiggle' but I am sure that is just them being on the low part of the cam lobe. Push rods looked good for what I could see. I could not depress any of the push rods from where they were.

I will open up the other side tomorrow.

I think I found a problem, lol.

So, do I just get another pushrod and hope it was a fluke or open it all the way to inspect further?

I ordered a scope from my phone, it will be in Thursday. I really do not want to open it up.

So I looked and saw the following photos, not sure what I would expect to find if it was bad. Obviously the lifter guide has some damage, but otherwise looks good. Thoughts?

Great news, I went to a 'you pull'em' salvage yard and they did not even have me pay for the three push rods I took. (I only needed one, but why not have a spare or two?)

I installed in and was able to get everything put back together. Fired right up and runs great. I mild hesitation, but nothing I am concerning myself with at this time. I let it idle for about twenty minutes, then drove up to the gas station. All good!

Thank you so much for your time and insights into this matter. It was greatly appreciated!

And the hesitation is pretty minor. I am sure it will do better with more running. Time to get it sold before any new problems come up!

I did change oil after a five minute 'motor flush' was added. Sold it yesterday! I am not sure what the cause was either but I think you are on the right track. The rocker seemed fine.

Thanks for all your assistance in what turned out to be a pile of issues instead of just one!