Thanks for your suggestions, I'll have to check that out. To answer GreenMarineSVX's questions, she nearly has 160K miles and I live in the Colorado Rocky Mountains, so temperatures can vary greatly, lots of hills and bumpy roads. I'm as gentle on her as I can be, and I try to stay right on top of getting the oil changed, ETC. I do know that the spark plugs are good because I put new ones in last summer.
In concordance with my current problem, I just changed the fuel filter, oil, oil filter, put fuel injector cleaner in the tank, checked tranny fluid and checked the air filter, then took her for a test drive. She didn't die on me, but this problem has been so flakey that I can't say I've driven her enough to be certain that all took care of it. Thank you all for your help! Hopfully, I will have good news the next time I post. :-)