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My 99 tahoe was popping thur carb and exhaust then run fine this went for two weeks thought it was bad gas new in plus gass treatment now wont strart changed fuel filter turns over fine but will not start help
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If converter is cloged engine will have hard time getting rid of hot exhaust gasses and will have no power if it runs at all. Check for the gas that comes out - when you nail the engine lots of gas should come out - if it does not amount to much it is obstructing the flow of gasses and needs to be replaced.
It may not be getting gas if it set for 6 months or longer the gas may have went bad and clogged ports depending if its fuel injected or carb .=, try carb cleaner in gas tank.
I have seen fuel pressure issues cause this. Fuel filter, or fuel pump. However, I have also seen the catalytic converter cause this issue. The honeycomb, located inside the catalytic converter, breaks up and will block the exhaust when you accelerate. Engine power is lost, until you let off the gas and let it idle. Then, the chunk falls down from the exhaust port, and it runs fine again. Until you get on the gas and increase the velocity of the exhaust, and the chunk blocks the exhaust gasses again. Good luck
check fuel filter and pump ---fuel filter maybe partially clogged-- possible pump getting hot and or 99 known for corrosion problem in the connector at the fuel pump
I had a similar problem and believe it or not it was the CAT. An easy way to test for this is to remove the O2 sensor right in front of the CAT. Once you removed it, plug it back in while unscrewed from the exhaust pipe and start up the truck. If it runs fine, the CAT is your problem. This is just a guess and it would be an easy and very cheap($0) test. You did not say if the truck was diesel or gas. Mine is gas that was exhibiting the same problem as yours...good luck!
check for leaks in the fuel line from the gas tank up to the engine bay.the humming sound you hear at the back is your wheel bearing.it needs to be replaced.
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