I have a 2003 Grand Marquis LS and my wipers wouldn't stop. Would pull the fuse to stop them but eventually they just stopped working all together. I changed the multi function switch AND the wiper motor(has module inside wiper motor for 2003). Everything was great for 3 weeks. Today my wipers turned on by themself. The frustration. What else could it Be? Only other small issue is slight hesitation going up a hill when steady throttle but it only does this if its around 40 to 60 degrees and humid. An average person probably wouldn't even notice it, but I do. I checked the body grounds I could find and they seemed fine. No corrosion. Dry car everywhere. What could be causing the wiper issue? Could it be related to the slight hesitation/misfire feel when conditions are as stated above? No check engine lights. I appreciate any help. First post. Love my car otherwise. Beautiful car I scooped off an older guy.