Hi all, I'm far from an expert and hope someone has run across this before.
I have a 1989 Forrester with about 140K miles, regularly serviced. I've noticed this problem starting several years ago but have not been able to figure it out.
When there's a heavy rain going on, and I get in the car and start up, there's severe hesitation. I can add a bit of gas or floor the gas and the RPM's don't change out of the normal range, I can hear the engine racing, but the car hardly moves along, or does so slowly with a jerking motion.
NEVER have this problem in dry weather.
After driving for a while, the hesitation goes away.
Any clue ???