I had replaced the original rcm with a one modified with the "I'm so horny" mod, when I previously encountered problems. Then that one hiccuped and it was sent back and repaired and everything seems to be good. Questioning whether or not engine the would even start if the rcm was again having issues, I didn't think it to be the cause. Imagine my surprise when today, I swapped it out with a new one I keep as a spare and the engine fired up and ran fine. Didn't fix any of the other problems, but at least the car runs again. Thanks for the question. Now I have to see if there is a way to determine what went wrong with the modified rcm again!