Cold Morning Misfire

[Aeroguy]

My '93 has been running great. Drove 20km this morning to town, ran fine. On the way home she backfired a few times when I sped up. Solid misfire a couple of times on the side streets. Weather was just at freezing and air was moist. Could it be something like carb ice(I know it has mpfi)? Has ran great till now.

 

[dannyboy]

Are you using high octane fuel?

 

[Aeroguy]

yes, high octane but has stabilizer in it for the winter.

 

[Corvette GT1]

Have the Optispark distributor ever been replaced?
Look if the water pump leaks, if it does, it drops straight on the distributor and cause all sort of problem as you described...

 

[Aeroguy]

Likely opti original, about 95000 miles. No leaks. Got caught in light rain last year and gave no problem.

 

[Live Wire]

I'd check your gas as well. Near freezing temps can cause water problems due to condensation. I saw that you had some stabilizer in, but you might want to try some water absorber and see if that takes care of it. Might be simpler than the ignition...

 

[Aeroguy]

Will do, have lots on hand