I have a 2003 Toyota Camry with automatic transmission, it has a problem with shifting into drive gear, first thing in the morning and when it has been parked for like 15mins. Sometimes I am forced to rev the car before it shifts .Once it has shifted, it moves through all the gears easily. it also moves easily into first gear when I switch off and switch on in about 15mins after the car has been driven for awhile (as long I as don’t keep it off for long ). Of note is it shifts easily into reverse gear always easily.
Repairs done so far
Transmission fluid and filter has been change, and transmission has been flushed .
Any advice will be great , sadly we don’t have too many knowledgeable mechanics with this kind of issue in my country what I was asked to do is to change the transmission which I think is an overkill as the car drives smoothly except for this initial trouble in shifting. One more thing , when I move it into drive gear in the morning it finally shifts on it own after about 5mins ( the reverse gear shifts immediately) . Any other time of the day I will have to rev the engine, though the warmer the engine gets the easier it becomes to shift into drive gear when rev it .