I have a 99 toyota cambry with 189,000 miles. just recently when it rains a lot i have trouble starting it. After it hasn't rained for a while it starts. one place told me it could be the ignition coil, another the fuel pump. i lean toward the ignition coil. I think something has a crack in it and moisture is getting in.
engines hard to start when raining on 1999 Toyota Camry
If is cracked and allowing moisture in then would cause this problem. Does not sound like fuel pump. Cannot see why rain would effect it.