I am trying to fix a problem on my mother's 94 caravan,2.5l .The van runs great,never any problems,til it gets hot(approx. 80 degrees and higher).Then the van will stall and not restart til after it sets about 20 min.,then it starts right up and runs fine.I have not been able to see if it has lost spark or fuel supply because by the time I drive to where it has stopped,it starts right up.She had the fuel pump replaced(a local garage said that was the problem),but the problem still persistsAny help will be greatly appreciated,Thank you..