Car is backfiring like no gas it has fuel injection

turn the idle jet out 1/2 turn

Replace Engine postioning sensor

Check and test fuel injection system and fuel pressure.

if it is a 4.3 v-6 with multiport injection ,it may be the spider unit. try putting gas into the throttle body and see if it starts. if it does than replace the fuel injection unit (spider unit)

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sounds like it is running lean. Check engine light on?

You mean backfiring through the intake manifold right?

A tip in hesitation or backfire is usually a lean condition. If you have a MAF sensor, clean the inside exposed wires with carb cleaner. Do no touch.

I believe this is a fuel injected engine, not a carburetor engine.

Having said that, given what you've already checked and believe to be OK, I'd take a look at timing if I were you.

Could be a timing chain has either loosened or broken, allowing camshaft to get out of time relative to crankshaft. This could cause the backfire you describe.

However, before you go that far....after putting in the new plugs are you positive you got the spark plug wires correctly located ? Crossed wires could also cause a backfire.

Good luck!

it sounds like the your electronic fuel injection system is pulling to many amps and is throwing a relay maybe a loose wire grounding out? you have to go through the whole electronic fuel injection system and check each wire for breaks and proper voltage

If it is fuel injected,the fuel pressure regulator is most likely the problem,if it is carbureted the mc solenoid could be the problem,or carburetor needs rebuilding.

backfire is a sign of unburnt fuel. assuming your ignition and valve timing is correct the problem is either a poor spark/plug or rich mixture ie to much fuel (carburetor, not injection) or an air leak in the manifold system (exhaust) check these in this order.

is it on gas?
if so and its fuel injected do not touch the accelerator when starting.