Cloudy Radiator Coolant (After Flushing)

The dirty radiator fluid I drained was caused by leftover stop leak in the system. The exhaust test came out clean (I rented a kit) However, one problem began immediately following the last posting:

The vacuum needle began to drop and jump back up to normal until the engine shut off. I was able to have it start and run nicely after properly setting the timing and inspecting all electrical. I noticed some white smoke (not steam) coming out from the exhaust during startup. The day was already getting pretty warm, and the smoke did not dissipate. This wasn't normal warmup steam. it wasn't a lot, but it's never happened before. The smoke lessened as the engine warmed up (did not drive it,) but it still had small amounts of smoke while revving and idling. The exhaust smelled normal.

It warmed up to operating temp without overheating and started right up several times, but once the idle screw was adjusted, the engine stumbled and went back to a continuous vacuum drop (no misfire.) I still cannot see through the radiator fluid even after replacing it.

Whether or not it is all related, I think it's time to take it into a shop. I hope this helps anyone with a similar problem. Any suggestions about going into a shop with these problems would be greatly appreciated!