Catalytic converter could possibly be clogged. Are you getting any sulfer smell? especially when going up hills. Also if this is a vortec motor ( says VORTEC across the top of engine) they were famous for have the injector module leak in the intake.
If your engine is revving you can rule out engine trouble. Your problem probably has to do with your tranmission. You should have the 4L60e tranny. On my 99 Silverado, when trouble showed up it was to the tune of gear 1 driving. No other gear would engage. This is known as "limp mode". If your over drive light is flashing, it is your tranny.
SOURCE: car died out, there is
I would start with the fuel filter, and go from there. Maybe even run some fuel injector cleaner through it. After that comes the injectors themselves. Basically, start at the tank and work your way forward checking things. If you have any friends or an inexpensive mechanic that can check the codes, then go for it. It could save you alot of time and money. I hope this helps. God Bless and good luck.
SOURCE: 1997 s10 2 wheel drive truck. 4.3L v6 makes a loud
Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral.
It sounds like a universal joint in the drive shaft.Do you notice a vibration
along with the noise?
SOURCE: when gas pedal is pressed car dies
Fuel pump relay is just above the brake booster, change your spark plugs and wires. Check crank sensor. And reset and re scan your car. Code 12. Means ur computer is scanning well. You have to wait . Each code flashes three times. 12 x 3 then all trouble codes x 3 each. Then 12 x 3 again. To conclude scan
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