What cause backfire out throttle body everything is brand new from fuel pump to sparplugs all sensors an coilpacks
What is your question?
Car sat for years had bad fuel pump drained gas replaced pump and fuel filter car ran 3 days shut off started back moved on carport it backfired out intake wouldn't start replaced plugs wires both coilpacks crank sensor cam sensor maf sensor added new gas and little fuel treatment and car is still backfiring out throttle body it will try to start then backfire and just crank it does this repeatedly exchanged all parts again still doing same thing checked timing chain everything is dead on checked for vaccum leaks replaced all hoses no change I'm lost and it has no codes at all
What makes this problem better or worse?
It doesn't change tried when warm & cold
How long has your 1996 Mercury Grand Marquis had this problem?
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As I answered in another question -- that's a ton of parts replaced probably for no good reason. What about using a few of those dollars to have a professional evaluate your vehicle, instead of losing time, money and sanity?
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Sounds like some kind of air intake or emissions controls issue, or perhaps a timing / compression issue. Wild guess, as the car needs to be present with diagnostic equipment and a shop manual to figure out what is really going on.
