Missfire @ Idle in Closed Loop Only

[95BLKVette]

99 Corvette Convertible Stock LS-1 with 71,800 miles Idles fine up to 189F. As soon as water temp gets to 190F it starts missing at idle like crazy. Initially had Map code and found the Map sensor had come unplugged?? Plugged it back in and it worked fine for about 2 days, then it started missing again. Changed the Map Sensor and it still does it. Sets the following codes after clearing codes: 10 PCM: P300H History Missfire B0RFA: U1064H History No Signal BCM Body Control Module U1096H History No Signal IPC Instrument Panel Control U1016H History No Signal PCM Engoine Control Module No Other Codes Removed connectors on PCM and BCM and replugged...all clean and tight. PCM connector bolts torqued to specs. Checked from frame rail ground packs all clean. Think it may be an oxygen sensor with an intermittent therfore not setting O2 sensor codes, but I only have a tech 1 for my 95 and am just checking codes via the DIC on this 99. Any ideas? Stumped!

[jedblanks]

Do you know anyone with realtime datalogging equipment (aka HP Tuners?)

You can watch the O2 response times real time to tell if they are bad.

[95BLKVette]

Unfortunately I have LT-1 edit and also a Tech 1 scanner for my 95, but don't have the HP or LS1edit for this 99 and don't really know anyone close by.

I'm going to see if LS-1's web page offers the software for the real time viewing like they do for LT1-edit as I think the OBDII cables are the same for both.