[Elwood]

Can't thank you guys enough for sticking with me as this thing drives me nuts. I did go through all the grounds I could find, including the one in the distributor, which in mine is one of the 4 ECM harness wires going into the base of the distributor and screws right to the base. Didn't start under the dash yet but I have trouble connecting the dots between an interior ground connection and engine temperature. I've tried the vacuum leak test with carb cleaner and starting fluid to no avail. I commute in this car every day so it's usually too hot for me to pull spark plugs before I'm done for the night, but will run that down this weekend. I've checked all the vacuum connections a couple times but will re-run those again too. I "captured" the miss with an iductive timing light and really could not catch it on anything but the #4 & #8 under any conditions, and the cap, rotor and ignition module are new, and the engine really should only have 87,000 miles on it now and the distributor shaft is still tight.
I'm now thinking that the converter lock is beginning to engage again on coast down which seemed to go away when I replaced the TPS a month ago. The "symptoms" are definately temperature related as it was fairly cool this morning and car ran PERFECT for over 15 minutes before starting to miss/goofy fuel display/etc. and coming home this evening at 78 degrees outside the erratic behavior started to show up in <5 minutes. I'll give it another serious going over if my time isn't consumed this weekend. Still no hard codes set but occasionally get the #23 soft error. I've been wrenching on this "easy stuff" for ~40 years now and I've never seen one do this either.