I had another thread started for this problem but decided I might as well start over. Here's the story. I decided to polish my intake manifold one night and it turned out looking pretty good. While the UIM was off I removed all the solenoids underneath dealing with the twin setup(none of these had hoses going to them and were just there without a function since I have gone single). I am still running stock cpu and fuel(except a walboro pump), with the PFS at around 10 psi or so,(car is a 93 auto). I have been running the car like this for over 6 months or so and have had no problems. Anyway, after I polish my manifold and hook everything back up it ran fine and felt good. The next day I go to start it up, it fires, idling a little funny, and falls on its face under throttle, almost dying. looked over everything for a bit and was a little stumped. Later i started it up and it ran good again!!! WTF?? That was the last time that it has ran outside the garage and it is having the following symptoms: extreme flooding, as in after a few minutes of trying to just idle the car you can smack the fuel off in your hand, and bogging under throttle. here's a list of the things that I have checked and replaced so far,
TPS-was in check on both wires
replaced coils
replaced all injectors and new grommets
new battery
rebuilt alternator
02 sensor
went through the harness again and again
checked fuses
checked map sensor
deflooded the thing at least 6 times
new plugs
new plug wires (Accel 8.8mm's)
Some other things to consider, I am positive that the compression is good. 1 because when I am deflooding, I have someone else crank the engine and I can feel the pressure coming out both holes and it is as strong as it has ever been, and 2 whenever the car is started there is no shaking and the pressure out the pipe is good. another thing, there is no water on the plugs and not alot of white smoke out the pipe. So I ruled out a bad seal. Something interesting though and I don't know if this tells you anything but the plugs that are always really bad are both the trailing, the leadings seam to be ok. weird? The only thing that I know to do now is replace the ignitor,fuel pump resistor, map sensor, and possibly ecu. Any ideas?

 

Dude you gonna make it damn near impossible to diagnose replacing everything like you are. It's easily possible that you could have a damaged wiring harness or a connector some where. The extreme heat from this engine makes the harness brittle.

One of my diagnostic tricks is to remove all the plugs from the engine. Take one plug and connect it to the plug wire and ground it to check for spark jump when having someone else crank it over. Do this for each wire and plug rotating them to make sure they are working properly. You have to be really carefull doing this with the FD since the plug leads are so short. What I would do is put some old plugs back in the engine and check the new ones. This will keep the engine from blowing the gas fumes out the spark plug hole and possibly causing a fire. Odviously make sure the person cranking the engine is holding down the gas peddle to keep the engine from flooding with no spark.

This may not solve your problem but at least you will know that your new coils, plugs, and wires are working properly.