Older vehicles with distributor-based ignition systems need their timing checked on a regular basis, otherwise you can have a host of problems. Starting becomes difficult, idling will be rough, ...

This GM HEI has the typical gummed-up mechanical-advance mechanism. Note the corrosion on the advance-weight pivot pins (arrows) caused by voltage arc-over and lack of lubrication. Brad Urban at The ...

Improving fuel economy or gaining horsepower means making the engine more efficient. Fuel economy or maximum power is only obtainable when the correct air/fuel mixture or ratio (a richer mixture for ...