I always see "Is it my Opti-Spark?" questions. I want to point out one thing. When all else has failed, check this.....there is a small (about 1-2") vaccum hose that goes into the o-spark. Check this hose thouroghly for cracks or slices. I ran through the "is it my opti-spark?" thing when I had my 95. It tore me down, pissed me off, and just sucked. When I finally ended up deciding to change the Opti myself, I had it all apart and found the Opti was fine, it was that little $2 hose that had cost me weeks/months of frustration and nearly $300 in attempts to correct the infamous "stumble". You will need to get under the car or get it up on a lift to really check this.

I just wanted to share my knowledge and maybe make soemone else's life easier.

BamaZ28

 

How does the vaccum hose for the opti effect performance? I thought it was there just to help get rid of moisture that may get in the opti?

Just wondering

Jason

 

I dont think it was a opti problem, but the cracked hose was causing a leak to the intake manifold which I belive will also give you a stumble.

 

NegativeCreep,

Let me guess....nirvana? I am a big fan of the late Kurt Cobain.

Anyhow, to all others, this may seem like a small insignificant peice, but it can lead to the "opti-problem"

BamaZ28

PS It may not have been a "vacuum hose", I'm not sure of the real function, but it was what fixed mine. It resembles a vacuum hose.