Sputtering/Bogging

[JDMice]

Need some help here guys. For starters I rebuilt my KADE last year april and drove it from AL to FL from 12 noon to 8pm, what is usually a 4hr drive took me 8hrs, car kept sputtering as if no fuel and eventually i waited until around 7 when it cooled down and it drove perfectly. Left FL in june and drove at night to MO, trip went fine. In july last year when it was dumb HOT the car would sputter and bogg on the way home at around 5pm, its only a 7 mile drive, it would take me 40 minutes to get home. Now again this year its doing the same thing.
An old timer told me the fuel pump was vapor locking, is there such a thing? What could be my issue. New wire harness, new fuel filter installed this year, I need some help guys, please. Wife goes back to school next month and i'll be hoofing it in 100 deg weather.
What can my issue be?

[mikeabrms]

Chek the fuel injectors. Had the same problem. Use ony OEM, aftermarket caused more problems for me.

[JDMice]

Injectors are OEM, would the heat from the sun mess with them that bad

[compactfean]

The most common problems you will have in extreme heat is the coil, and igniter. vapor locking almost never happens in fuel injected cars.

[JDMice]

Added to the sputtering and bogging at take of i saw a drop in power before 3000 rpm then it would take off but with a puff of white smoke. I parked it about 3 weeks ago and gathered parts the upon pulling the head off tonight i realized there was cooloant in chambers 1&2, 1st and last piston very black on top and 3rd had like built up carbon, the head itself was all black around the piston chambers. Any suggestions as to any problem besides coolant leakage.