I own a 2000 lexus is 200 with approx 180 000miles on it. Runs great ! but in the last 2 months i have been having an intermittent problem with my 1g fe auto tranny. Early morning shifts into reverse and to a lesser extent drive have an associated delay before the car moves out. About 5 seconds.The transmission works perfectly afterwards and no slipping at all. One other thing is that if i park facing downhill , sometimes (not always) when i put in reverse, the delay is about 10 seconds. If i rev to 1500 rpms then then gear jumps in. Drive is normal. I have suspicions about the filter needing changing but its hard to find one. Also the oil is only 4 weeks old, no leaks, no discoloration of oil, oil level ok. Any suggestions?????