You said in post #9 it had a rough start then you drove it home. Was it backfiring, hard to crank over and sort of jerky or was it easy fast and smooth and started on one or two cylinders eventually running on them all? How far was the drive home? Did it get hot, idle rough or die at stops? Did you have to slowly accelerate from a stop to keep it from backfiring? Did the engine kick back or backfire when you turned it off? After you sprayed starting fluid down the intake and it didn't start if you immediately took out the plugs they should be wet with fluid. Were they? Did you check for spark at the plug while cranking and did it spark several times or just once when you turned the key on and off? Sorry for all the questions but since you said you were new to this I just want to make sure the results you post really answer the questions we need answered. And by the way maybe put a shop rag between your thumb and the spark plug hole so if it won't scare you when it tries to suck your thumb off on intake stroke.