Last Thursday going for supper, our Wing started making a noise that sounded like a loud lifter or maybe a chunk of the timing belt had come off and was being slapped around a pulley. The noise quit and ran ok? As we made the turn to go on the 4 lane it stumbled hard and wouldn't hardly pull itself. I kept the rpm up and was headed for the next turn off and again it started running fine. We had 2 lights to go through didn't have to stop but was headed for the restaurant parking lot so we could call for a tow if needed. When we final stopped it was missing again but it sounded like it was coughing through one of the carbs.
My wife said lets eat and we'll call if we need to when we get done. YES dear.
When we came out I fired it up and it idled fine?
We drove home and it ran like a champ.
This morning I got ready to go to work and again it was not running right, missing big time. After about 3 minutes all the cylinders chimed in the idle jumped up. I didn't take a chance. When I got home I pulled the plugs and no. 3 was black and soot covered. The rest were tan, gray. After a quick clean and re gap it still ran like crap. Missing in all rpm ranges, plugs were new 800 miles ago. Also found a melted vacuum cap on number 1 carb which I replaced. Couldn't find that one in the book though. Searched the board nothing stood out as being the same will try a compression test ASAP.
Maybe bad fuel.
What I'm looking for is a direction to head. Seafoam first
Any help would really be appreciated
It has 64,000+ miles, it does use a little oil added maybe 6 oz all summer along with a pint of anti freeze. These were added over the course of the summer season, maybe somewhere north of 1,000 miles.