96 v6 running weird. Couple pf question a before going to mechanic

On first startup, every time warm or not, the motor runs like its flooded. Idles very rough, almost dying, belts squeaking, then I hear a rattle that seems to be in the top somewhere. Sounds like a rock flies through the runners after the throttle body. Then, all of a sudden it smooths out and seems to be running fine save for one little ticking on the drivers side. Timing belt maybe? But it wouldn't slip then all of a sudden catch in just the right spot every time to get back in time. At least I wouldn't think so.

I though I'd go for a tune up, plugs, wires, oil, fuel filter air filter.

Let me know what you guys think. I'm not to familiar with these motors. Been driving diesels for a while now. Gonna stop and get a manual today.

Thanks in advance
Dustin