92 LSL misfiring, terrible fuel economy, CEL codes... Help?

[DiabloScoobyru]

Hey guys, having some issues with my LSL. Here's the back story:

Car is a 92 LSL. Has the 4.44 tranny (~135k miles est., ECUTune controller, 173k miles. Still stock in other respects (it was formerly Will/PaladinWKH's car).

I ran out of gas last Friday (stupid gas gauge ). Filled completely with 93 octane and injector cleaner. Car ran fine. Took my friend home this past Tuesday and she put 89 in About 1/3 of the way home, the car started running rough, acting like it was misfiring, then threw a CEL. Pulled over, turned the car off, and let it sit a few minutes, then resumed the trip. No CEL, but car still ran rough (assuming its due to the 89 she put in...women ) On Wednesday I went and picked up a bottle of Envirotek G.T.A. octane boost/injector cleaner and ran it through the last 3 gallons in the tank. As for fuel economy, I went less than 80 miles on an estimated 6 gallons of gas

Now fast forward a week. Car threw a CEL at me Friday night, as well as this afternoon, started running rough and hesitating on accel, and felt like it was lacking power. Filled again with 93 octane from the BP station Friday, and ran a full can of Seafoam through the tank. Ran a bit better, slight increase in power under accel. But the car still shakes like a tank under idle or torque convertor lockup and hesitates pretty bad from a stop. I ran a can of Seafoam through the intake this morning after pulling the codes, and I noticed another improvement in power.

Now as far as codes go, I pulled a 37 (which is my LH O2 sensor, that I ironically replaced a month and a half ago), and 14 through 19 (Fuel Injector Inoperative. Abnormal signal from monitor circuit).

My question is: Do these all go hand in hand? I.E., does the O2 sensor send the signal to the ECM for the injectors? Luckily the O2 sensor is still warrantied (12 month/12k mile), but I'm wondering about the injectors. The car does seem like it is only running on 4-5 cylinders when idle, but it does perk up when I mash the gas and get into Power mode (feels normal then). Any ideas here? I'm stumped. Only thing I can think of is I have a fouled out spark plug from the 89 octane, and I have to pull the plugs yet to have a look tomorrow or Tuesday when I can get into the garage with it (currentl 19 degrees here in Reading, too daym cold to do it outside lol).

If it is the injectors being fried, are there rebuild kits available for our injectors?

Any help is greatly appreciated