Originally Posted by upton7
how old are the plugs?
^ Did you replace the sensor with a Motor-Craft part, or AZ's brand? How many miles and how old are the belts on it ? When is it better? When is it worse? How often does this occur? Is there any knocking? sorry for all the questions but sometimes more symptoms may help to pin point more ideas. I'd try to replace the bolts asap though. It probably wont hurt to leave it with one, but having those 3 extra isn't a bad idea.