Smoke coming from the rear
 

Smoke comes out of my muffler like crazy. Sometimes there's a lot sometimes it doesn't smoke at all.what could be causing this!?
Then just recently smoke is starting to come from the front and under.

92 accord dies when a/c is on
 

My car dies when I come to a complete stop and the a/c is on. The idle drops, the whole engine starts to shake and then it dies. Why?

your AC compressor could be seized/seizing, so when you come to a stop and the throttle is closed the stuck belt kills the engine.
is it blue, white, black smoke?

It's white smoke and it stinks.

MY boyfriend had changed the seals on the valve cover along with the seals on the spark plugs.( I don't know if that's the same thing) but it still smokes but not like before.it also smokes when I use my a/c.

White smoke is usually the sign of coolant being burned. Does it have a sweet smell to it? Is your oil or coolant low?

Tell me something I don't already know!