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ive had this problem for awhile now. i live in vegas in 100+ heat and my Bronco began to stall at high temperatures but would restart once cool. i replaced the ignition coil with a performance MSG coil. i changed the rail side fuel pump, fuel filter. changed throttle position sensor,o2 sensor,and even my fuel pressure regulator. my cap, rotor, plugs and wires are all new and i started it up after each relacement and it actually seems to have gotten much worse gradually. what the hell?? it pings and backfires so bad that i think i have a fat exhaust leak around the manifold now just from going around the block. also new problem. ive checked every hose and vaccuum line i can see. nothing visualy out of place. 88 302 i am clueless and no i havent ran codes yet, been waiting on meter to be returned by friend for days now :( and my new fuel pump whines very loudly even worse then when the old one was about to go out.
 

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Backfires thru the exhaust or intake? Have you check fuel pressure? I've had a set of spark plug wires fail within six months. Have you changed the fuel pump in the tank? How many miles are on the motor? Just some questions to try and narrow it down.
 

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I had a bad high pressure pump right out of the box a few months ago. Have you checked your FP? If its making that much racket it may be bad. Also, did you check your tank pump or atleast replace your strainer when you put the new HP pump on? If your strainer is clogged and that caused your old pump to go bad you could have killed your new pump already..
 
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