I have been chasing erratic tuning issues in my '01 supercharged Vette for a while, and I'm starting to think it may be the PCM. Indications -- When the RPM is brought up to 2000 (+/- 200), the right bank goes so lean the engine stumbles. This occurs in neutral, or under light to moderate acceleration, and only occurs if the engine is hot. And the hotter it gets the worse it gets. Today after many minutes of testing while parked the coolant temp got up to 220. At this point I also noticed that during the 2000 RPM stumble,the A/C compressor would disengauge!! Above or below that RPM the A/C compresser would re-engauge.
Does this sound like a bad PCM??