1997 honda prelude, starts up fine when cold, when the engine is warm it struggles to fire up, idles low, dies

Make sure that your catalytic converter isnt blocked by taking it into a garage. If it is blocked then ask them to replace that section with a pipe. I say this because I had exactly the same thing happen to me almost exactly how you described it about 2 weeks ago. If it is not this.. Check 02 sensor or MAF sensor. Air filter. Oil filter - or switch for radiator fan. Hope this helps you!