Short story is I bought a 1993 Chevy Lumina last night; it ran very badly but was able to get it home. Tried to start it this morning but; it would start, car cranks fine. I sprayed some carb cleaner down the PCV hose fitting on the air intake duct and, it started then idled roughly. Drove it to a shop close by; had to 'power brake' it to keep from dying at lights. Got to shop and scanned it; 4 codes (IAC, coolant temp sensor and a couple of others). Cleared the codes but the temp sensor remained; replaced it and cleared the code (14) again but it kept coming back, the 3 others stayed off. Drove car; it ran rough and is down on power but no longer stalled at stoplights. I swung into a gas station and topped off the tank with premium fuel, started driving home, was almost there then the car died in flight. At least I was close to the house I was able to coast on in. Now no start at all; engine cranks well but nothing, not even a sputter when I sprayed carb cleaner down the intake. I'm guessing something ignition related but; underhood work isn't my forte. EDIT: I went out and hit the key again; car started right up but still ran rough although it still didn't die in gear, drove it next to the house and parked it for now.