89 5.7l issues... she won't play nice

[JaggedEdge]

Ok, Im' gonna try and give all the pertinent info so bear with me. Shop remodel... load of demo sheetrock... go to the "pack mule" a retired service truck. 1989 Chev K1500 5.7l auto factory non-ac truck. Been sitting in the storage building with all my other "projects" for almost a year. Battery is hot, tires all have air, starts right up. Has about an eighth tank gas, so go fill it up. Load all the demo to hual to transfer station in town about 6 blocks away.
Pull out the door truck dies, Crank , crank, nothing. Pull breather.. can't tell if fuel, but can hear pump prime and shut off. Check spark... nothing. Had a 79 Impala that ate ignition modules every six months, so mind says.. meh... lets try it. Hot shot in my DD to Oreillys and get a replacement module. Cleaned the dist. base, made sure to evenly distribute paste, install new module. Put it all back together... fires right up! Lets get this thing unloaded.
Runs really rough to the transfer station. Turn it off to unload, get 'er done, starts right up. Still running really rough, tries to die, sputters, then blows the muffler into pieces!! Get back to shop ok. Stutters, stumbles, and backfires the whole way. NO trouble light... nothing.
Ok let's start to figure out what went wrong. When I put the module in the dist. the hold-down bolt was a little on the loose side,(could turn the dist. with very little pressure.) Thought I might have gotten it out of time. Put a light on it, unplugged the tan timing wire as directed, set the timing to 0 degrees as recommended by the decal on the fan shroud. Noticed the service engine light was now lit. Shut it off, plugged the wire back in, started it up. Still ran the same.
The exhaust was "burn your eyes" super rich, and when you accelerated it stumbled, and backfired, couple times through the TBI, but mostly exhaust.
Did the paper clip trick and played "count the flashes" (no scanner). Got the usual 12...12...12... then 33 three times, then 42 three times. Interesting.
Took the battery cable off to reset... fired it up... same deal only no service engine light. Can't really give it a run-out on the road to reset the "learning curve" as it won't run over 15 mph.
Anyone want to take a stab at it???
I am of the old school, non computerized generation, and know my way around the inside and outside of chevy's, but when it comes to computerized fuel systems I am nowhere.
I am curious why it set the 33 code when I was timing it, but not afterwards. Still has not set a code.
I changed the fuel filter, but do not have the tools to test fuel pressure. (yet) I do hear the pump run for a few seconds after I shut the engine off.
I also noted it takes 35-45 seconds for the fast idle start to come down to normal idle. It did not do this previously. Engine is up to operating temp.
I also wonder if the dunzleheads at Oreillys might have given me the wrong module.
I will try to answer questions if anyone wants to offer some diagnostic help!! And it would be GREATLY appreciated!!