'89 Toyota PU, won't run when wet?

Another thing to look for (just like Dodges), the distributor cap draws a lot of moisture.

My grandfather's 86 Toyota 4-Dumber (4-Runner) with the fabulous gutless wonder 22RE engine won't run right if it rains hard or is really damp. The fix? Pull the Distributor Cap off every 6 months or so and spray Silicone inside it to keep the moisture away.

My D50 would do the same thing (back when I had a 2.6L in it), even though the distributor cap looked dry inside, the truck would spit and sputter on rainy days, until I started spraying silicone inside it every couple months.



Like Rob mentioned, The Ignitor is also known to be an issue. Could even be something simple like moisture & corrosion gathering in the plug/connector