My Crown Victoria has been running rough lately. It doesn't like starting, it rattles when starting, (which I've heard is a timing chain symptom) and it starts running rough at lower rpms. It hasn't stalled yet, but it's running like it's misfiring at lower rpms. I have to slam on the gas to keep it smoothed out at times, then at other times, it runs perfectly. It's strange and inconsistent. It's also now making a squealing noise in the vicinity of the belt, which doesn't really make a whole lot of sense to me since I changed it about 15,000 miles ago. Would a bad timing chain, or a mis timed timing chain make a squeaking noise about like a bad serpentine belt? I've changed timing belts, but not chains, so I don't know.
I'm already going to put in a new belt, new plugs, clean the filter, and put in new wires, this car has to run properly since I'm about to start working pretty far away. But I'm trying to figure out if I should put a new chain in it too. I suppose it could use one, the car does have a buck thirty on it, but it's a bigger job than I care to do right now if I don't have to.
Any opinions on if it's my timing, or maybe something else?