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98 Toyota corolla, I have intermittent problem. Feels like a miss. moving or stopped?
When temp. outside goes up it gets worse. Car shows no codes. can't tell if it is the engine, trans, or computer.

It sounds like you need a tune up I had a Toyota Corolla 1988 for nearly ten years and it did that when it needed spark plugs. Tune up. :

i have a 1995 toyota corolla

You need a tune up and have them change all filters and check the timing belt.

Does it happen in park as well, when sitting still ? If so you may be able to rule out Transmission, it may be Ignition or Fuel problem.

you should check the cooling system,radiator & cap,thermostat after that have a basic tune up 1st,cooling system flush,oil change,transmission liquid replaced if you didn't had done for a while.GOOD LUCK.