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If it's backfiring through the intake, then more than likely it's a timing issue. The distributor cap has the cylinder numbers molded into it where the plug wires go... Make sure the wires are in the right spots. If that's good, then it's possible the distributor isn't lined up right.
if hot enough to shut down major damage to piston rings and now cylinders have no compression so wont start you can try to oil them back up .unless when gasket was done timing is off ck it also
It needs at least 60psi fuel pressue to start. You need to check fuel pressure with a gauge. If the dist cap or rotor is bad, the spark will not be on the right plug at the right time. Same goes for a faulty distributor or a problem with the timing chain. And the ignition module. Also check the ecm for trouble codes.
the one possible problem is the egr valve. If your blazer has the Vortec 4.3, the valve is located on the front of the intake manifold. You must remove the intake rubber boot on the throttle body to see it better. It's very possible that there is chunks of carbon holding the valve open. I recommend cleaning the egr valve ( carb. cleaner works great ) and replacing the Egr gasket with a screened gasket. This will take care of it stalling and surging.
you could have intake leak.also intake leak at injector o rings or seals leak.when replacing intake gasket you have to tighten in sequence.if not intake gasket will leak again.
There is a tester you can use that screws on the radiator cap and you can pump it up to see if it has a leak down effect in the system.. This wont tell you where its exactly going but tells you if there is a leak in the head or intake gasket.. probably should start with the intake and replace it and see if it does the trick .. if not then tear it down and replace the head gaskets and or check heads for cracks also.. thanks Jerry
if it has the central fuel injection, the regulator is on the metering
body under the intake pletium. auto parts gets about $45 dollars for it. you also need to replace gaskets as well.
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