starting 94 olds 88 after rain

in the morning when it has just rained or theres moisture in the air the car sounds like its backfiring under the hood ...it has bottled for a while now almost like it has a bad coil had one replaced about a year and a half ago just started doing the rough start thing it also has no acceleration ...............any ideas?

I had the same symptoms on my 92 Olds 88. It's interesting, that it was about a year after I replaced the coil pack. It turned out to be corrosion on the plug wires at the coil pack. I replaced the wires, after cleaning the coil terminals and she's been running great ever since. It's certainly possible that you have the same problem. Just pulled the plug wires, one at a time, from the coil pack or packs. You'll see any corrosion that may be there. Good luck, let me know what you find.

And take a look at your other post some times it's corrosion on the back of the coil pack it self and motor mount ...

Creative

CreativeMod@hotmail.com

Don't forget about the spark plug wires itself. Older spark plug wires suffers misfire if there is moisture in the engine. Cheap spark plug wires does not have a good insulation.
BTW, make sure your spark plug wires are separated from each other with a spark plug wire sepator and use some tie wrap to move them away from the engine block and not touching.

One way to find out if you misfire or cross-firing, try starting the vehicle at night no lights. You might want to use a tarp to cover the open hood and around the front of the engine and see if you find some arcing or cross-firing.

The ignition coil themselves might have a crack around it and allows to leak out the high energy voltage from the ignition coil.