Sudden Cut-out While Driving, ~faulty relay board was the culprit Options

[poorsche914]

Driving to work this morning and my 2.0 D-jet suddenly cut out. Tach dropped to ZERO. It fired back up fairly quickly being still in gear and rolling. Did this twice.

Made it to work and when I went out to start it, would not fire. Can hear the fuel pump and have fuel.

Ideas where to start looking appreciated.

Some more info that may have impact:

Optima red battery that has a bad cell or something... drains overnight to around 75%. Other than that, cranks strong.

Just replaced the relay board a week or so ago due to intermittent starting issues. Could go for weeks with no issues then turn key and starter would not engage. Rolled it off to start it for a week or so and then suddenly ignition worked fine (IMG:style_emoticons/default/confused24.gif) Finally quit working altogether - couldn't even roll start it.

Thanks,
steve

(IMG:style_emoticons/default/driving.gif)