Hi, CSWill; Sounds as if the engine is being flooded. You mentioned that the temp sensor is disconnected. The PCM needs the information from the sensor to control fuel delivery. If the engine is cold, it requires more fuel. As it warms, the need for fuel decreases. Especially, on GM's, when the temp sensor takes a dump, it will default to -41 degrees (F) and cause the massive overfueling. The engine oil is surely contaminated with fuel, by now. The PCV system will send the fuel vapors into the TBI and just make things worse. By 'floorboarding' the throttle, it shuts off the flow of fuel for that moment, allowing you to start the engine, but.....
The first things I'd do would be to change the oil and filter (so you don't have another explosion) and replace the CTS. If you have a scanner, you can 'see' what the PCM is seeing as to engine temp. Compare it to the ambient temp. The spark plugs are probably fuel soaked, also. May have to remove, dry, and reinstall after about an hour while letting the cylinders dry out. Compressed air into the cylinders will speed up the process. I've even disconnect the ignition (no sparks) and cranked over the engine. You'll see fuel being spit out. Watch for fire, of course.
'll make it short and sweet.
I own as the subject implies. It had.
It began to run rough, bog down and completely stall out upon pressing gas pedal to floor suddenly. Had to press pedal to the floor to get it to fire after a 15 second crank session. Into gear, stalls out. Had to keep gassing it to take off. Operating temp seemed to make things better.
Added fuel injector cleaner, sat over night. Truck stopped starting. (Purchased it sitting up for 8 months no driving) began the arduous quest of troubleshooting...
Replaced rotar button and distributor cap, didnt take note of the 1-6-5-4-3-2 firing order so put the plags back on wrong. Wouldnt start. That evening researched and learned of the order and how it corresponds to the plug placement, next day corrected plug.placement, pressed pedal to the floor,.cranked it and it started, I revved it for about 10 seconds, BOOM!!!! Intake backfire and actual fire on TB! Put fire out, inspected no real damage. Perplexed. Take note of a few conditions.
1. Oil pressure read low when key is ON
2. RPM guage goes to 20 then gradually works its way up past 55 when key is set to ON. ??
3. Lean condition evident
4. Temp sensor is disconnected
5. Heater core is bypassed
6. Blower motor doesn't work
7. The joint where the top engine cover that the oil tube comes out of is a gap an in wide with what looks and feels like an air filter exposed... ???
So, i assume the fuel pump works as in watch it spray from the injectors. Fuel filter! I check it. Man, let me tell ya.. nasty. I replace it. I try to start. No dice. I tried to prime fuel pressure. No dice. So I try old faithful. Pedal to the metal, crank. BOOM!!! Oil cap, PCV valve and blow by hose all shot out or off engine. Fire. Extinguished. Now when trying to start it loses power during crank and starts over repeatedly. Doesnt seem to have spark now or just doesnt even act like its gonna start.
Update: I've removed the passenger side valve cover and think I'll buy new ones and gaskets and see what happens