My 2002 2.3 liter Ranger is normally dependable, but recently it will not start. It cranks quickly enough, gives a strong spark, but doesn't light up. The spark plugs are dry when I remove them, even if the accelerator is floored. I swapped the fuel pump relay, thinking fuel problem, and it fired up and ran fine; however when I ran into the same problem yesterday, swapping the relay had no effect. The truck started later in the day with no repair.
The truck is used very infrequently (roughly 1 time per month); it only has
5,000 miles on it. Could the infrequent use be a contributing factor?What is the next step in troubleshooting this problem?