It's an optispark. It's under the waterpump, behind the harmonic balancer. It sucks.
Average life is about 100,000 miles, give or take 80,000.
You should get your replacement from GM. As with almost all GM parts, you should get yours from Dal Slabaugh. Email is [email protected]
. Cost is around 200 bucks this way, or waaaaaaaay more from your local dealer. Call around if you don't believe me.
Steps to remove and replace, in a nutshell: Buy a new GM Optispark and waterpump. Replace them as a set, because if the waterpump leaks, it will destroy your new distributor. Cost for both for my '96 was about $330 shipped. Drain coolant. Remove waterpump. You will have to remove a couple of bolts near the AIR pump, so remove it, too. Throw AIR pump in the trash, where it belongs. Pull harmonic balancer, leaving the small hub on the crank snout. Remove Opti, noting where the plug wires go. Replace Opti, being sure to line up the correct notch on the back of the Opti with the nub on the cam. The correct notch on the back of the Opti is the squarish looking one that is different than the other two. Use thread sealer on any bolts that go into the water jacket. You can identify those, because coolant will come out when you remove them. Put plug wires back on where they go. Put on harmonic balancer and waterpump. Fill with coolant and distilled water. Start engine, and open bleeder valve on the water neck a bunch of times to remove any air in the system (IMPORTANT). Get your PCM reprogrammed at www.pcmforless.com
to remove programming for the AIR pump, and to get your fans to turn on when they should, and make the engine run better and tranny shift better. Enjoy. [img]smile.gif[/img]