OK; over the weekend I installed the new plugs (41-940's), wires, O2 sensor and fuel filter. Orig plugs were also 41-940's, looked OK, four were tan/light brown, #4 & #5 were darker brown/black but no liquid oil/gas. Also, when replacing the spark plug wires I noticed that the #4 and #5 contacts on the ignition coils were rusted/corroded, all the others were bright and shiny. First few times starting after these repairs, the engine idle cycled from ~400-1200 rpm; and even quit after cycling like that for about a minute. But, after 3 or 4 short drives, this smoothed out and everything seemed fine again. Then, I went for 20-mile drive and engine stalled as before but this time would not re-start. Had it towed back home; not sure what to do now. I did get three new ignition coils and will install them tonight. I'll borrow the OBD-II code reader from Auotzone tonight, maybe there will actually be a code now that its become un-startable. I'll inspect the MAF sensor, but wouldn't that have already set a code? Some advice would be greatly appreciated. And is going back to the 180-deg thermostart (while I'm under the hood) a good idea? Thanks.