ok, im a rookie at this, but I had a similar problem that accured out of the blue. I checked all the sensors from the MAF to the fuel enjectors. Everything showed fine. After two days of banging my head and reading, I took it to the dealer. It turned out to be the distributor. The coil showed good, but the distributor was bad.
A costly part, about $500 installed. I hate to even say it, but I found one at car-parts.com for $125, and I was and running.
Also I have a boor with the codes for the ECM. Email me and I can scan the page for you.
bca864@comcast.net
Good Luck