Toyota Repair: 91 Toyota Camry 4 cyl automatic stalls, toyota camry, air mass

Question
car has 134K miles. Only stalls in morning, esp after rain. Sometimes even has trouble starting. Then will drive OK as long as I keep my speed up but will sputter and hesitate as I slow down. When I stop, it stalls.  It will do this several times, but only when first driven, will be fine by the afternoon. The problem is worse the longer the car sits without being driven (like over the weekend). I've changed air filters, plugs/wires, had tune-up, fuel cleaner, put in a used air mass meter, probelm still there.

Answer
Check the ignition coil inside the distributor, remove the rotor and the coil cover, these coils are known to develop cracks or burn through(arcing to ground) check it very carefully on the top epoxy filled area and use a mirror and a light to check the underside for arcing spots.