You my have the cause and symptom reversed. Sounds like you have a intermittent electrical problem, and when the voltage goes up to where it should be you get a better spark... Causing the surge. Michael R Dixon wrote: > > Recently I have had a re-occuring problem. While traveling in 5th gear the > engine surges and the voltage increases. Why? > I've also noticed that while at an idle the engine doesn't idle smoothly. > It doesn't cut out it just surges every now an then. Any ideas?