Deputy of Mayberry
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If they're the originals, DEFINITELY replace the plug wires. I'd be surprised if that doesn't fix it. In my experience they're good for about 120k before they start having problems. The recommended change interval for the plugs and wires is 100k miles.
The smoke from the back area is *probably* from the valve covers leaking. The oil likes to run down the backside of the block and drip onto the exhaust where it slowly burns and makes some smoke and stinks. It's a very common problem.
I'm guessing the high amount of misfiring is sending a lot of unburnt fuel down the exhaust where it's getting burned by the cat. Then that generates a lot more heat than normal and it's making the leaking oil burn more quickly. Hence the smoke.
Edit: I forgot to ask - when the disty cap was replaced, was the rotor also replaced? If not, and it's also the original, definitely replace the rotor too. It's cheap, like 5 or 6 bucks. Maybe $10 if you go OEM Toyota.
1992 Camry LE, V6 (3VZ-FE), ABS brakes, dark emerald pearl, owned since new. Replaced HGs @332k, now at 371k miles
1996 Avalon XLS, ABS brakes, super white II, acquired w/ 139k, now at 312k
2001 Yamaha FZ1, Ivan's jet kit, resprung, Ohlins rear shock, Race Tech cartridge emulators in forks, 49k
Last edited by BMR; 02-28-2011 at 01:55 PM.