I have a rough idle at random times, for example in the morning it doesn’t idle rough but later in the day after not starting it for a few hours it would have a rough idle. Misfire somewhere, or atleast I think. No codes, no check engine light. Put new spark on it a few weeks back new plugs and wires because one was chewed through. I tested for vacuum leaks by spraying wd40 on the connections but got nothing. Please help

 

Welcome to the forum

What Year Ranger and what engine?

Try cleaning or changing PCV Valve, applies to any year and any engine