i just rebuilt the motor in my 95 lt1 camaro. i had a misfire at low rpm im in the process of now putting in a new optispark .but was curious if while i have it off if i should replace the sensor and the litttle metal reluctor ring that sits behind the optispark case or if just replacing the cap and rotor will solve my problem

 

If just replacing the cap and rotor, how many miles on the rest of the distributor?

The sensor in the back 1/2 of the Opti is the optical cam position sensor. If there was a problem with the sensor, you would have DTC 16 and or DTC 36 popping up. If you don't have those codes, you probably have a healthy sensor. On the other hand, the bearing is in the back 1/2 as well, and it's not very reliable. Look for signs of the rotor not being "solid", having a bit of wobble. At that point, a complete replacement of the distributor would make more sense.

 

96k on the distributor. The only codes are from the ac compressor.

I eliminated the secondary air injection system and plugged the holes in the headers. Smells like its running rich. Would I be better unplugging the vacuum pump or leaving it plugged in?

 

Its not a vacuum pump. It's a blower the blows fresh air into the exhaust manifolds. It only runs for a couple minutes at startup to help the cat(s) heat up faster. Then it shuts down. It does not affect the way the engine runs. If you didn't fully seal the connections for the air at the manifolds, it can cause the exhaust to induct air, make the O2 sensors indicate "lean" and cause the PCM to add extra fuel the engine doesn't need.

You need to provide a "Signature" with basic info about your car - year, model, engine, trans and any major mods. The AIR system, for example, has three different variations (93, 94/95, and 96/97). Then there's the complication of an AIR system recall that only affected 95-97.