My 1997 camry v6 misfires badly ,intermittently, shows code reading cyl 1 3 5 misfiring ,installed new plugs ,wires and 1 new coil pack alternated in all 3 places.

SOURCE: Random Misfire on 2 & 3

I had a problem with a chevy with random misffires on all cylinders. It was the computer. Fords have very few problems with there computers. Does the check engine come on? Maybe have it scanned. 

SOURCE: 1997 ford f150 cyliner 7 misfire

sme problem had to have it put on computer and codes reset

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

SOURCE: Intermittent Misfire on cyl #4 1997 Buick Lesabre

How's your coolant level? The intake manifolds on the 3.8L engines are prone to breakage at various locations causing coolant leaks into the crankcase and vacuum leaks on intake ports.Removal of the upper intake manifold will be necessary for inspection. Also, check for vacuum leaks at various locations on the outside of the intake manifold using WD-40 or brakeclean/carburetor cleaner sprayed hoses, non-electrical components, at the base of the manifold etc. As for a faulty injector, not likely but if you suspect one you can always swap the suspect injector with another on the engine and see if the misfire follows the injector. Just be sure to relieve the fuel pressure before servicing. Hope this helps.

SOURCE: coil pack

Cylinders 2 - 4 - 6 are facing the radiator. Cylinder 2 is closest to the drive belts.

Cylinders 1 - 3 - 5 are facing the firewall, cylinder one closest to the drive belts.

Hope this helps; and Thanks for choosing FixYa for assistance.