NEED HELP. 80 fuel injection spider that is just running rough. It had previously done this over the past 2 years a few times going down the road it would loose power and sputter, but would simply go away after a few seconds, or stopping and restarting the engine. Now it won't go away. Checked spark plugs, this time one was shot. Replaced all spark plugs, still rough. Ignition problems? Injection problems?