I have a 1991 rs 3.1L v6. It ran rough for the longest time and i couldnt find out why. The other day it just died on me and i couldnt figure out why. i pullled a spark plug off cause i know its getting fuel and found out my spark plugs where bad so i replaced them. still didnt work. so i changed the spark plug wires and it fired right up. drove it to work and back and it ran like it was brand new, no codes came up or anything. The next morning i went to start it up and it wouldnt start. i am getting fuel and spark. when it tries to start it barely gets going and for maybe 5 seconds it runs but blows a bunch of smoke or exhaust out of my air intake. i have know idea why this is happening. my valves are moving, im lost if you have any ideas please help me out. thanks