I have a 1995 Camaro 3.4L, and the car has recently developed an ignition miss. After changing the plugs, wires and coils the miss is still there. Not too long ago I did change the timing chain while I was repairing the crankshaft seal, and I would like the check the timing to make sure that the chain didn't stretch, etc.

 

There are several reasons for misfire:
Is the check engine lite ON or flashing? If yes get the car scanned before throwing more parts at it.
1) Ignition problem. You did not mention changing the ignition module under the coils, you should get it tested.
2) Fuel problem, lean mixture due to low fuel pressure, bad injector, dirty fuel filter, air leak after throttle valve.
3) Bad sensor, you may have damaged the crank position sensor when you changed the timing chain.
4) EGR valve not working properly.
5) Restricted exhaust or intake, such as dirty air filter, clogged exhaust.