The jerking motion at idle or at starting acceleration makes me think of a dirty/failing Mass Airflow sensor (MAF)... or something related to air intake like throttle body, etc. Try getting error codes, It seems to me it would show a sensor error, either MAF or O2.
Make and model, year, engine, transmission? 2wd/4wd, ever been wrecked, etc.
could be drivetrain parts such as c.v. or U joints.
could be fuel system clog somewhere.
could be a bad sensor.
We will need more detailed information.
SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....
try replacing your EGR Valve, or your Oxygen Sensor
SOURCE: 1999 Chevy Silverado with clunking/jerking in the back
It sounds like your 4WD is still engaged and you need to have it serviced. It's common for the 4wd to get stuck in the on position with the button pushed to the 2wd mode. As you turn the front wheels are binding with the rear wheels. There is a vacuum switch on top if the transfer case on the drivers side that may have gone bad and needs to be replaced. You can pick it up at Auto Zone for $25.00 and $85.00 at the dealer, there is three vacuum hose attached to it that needs to be disconnected and then the switch can be un screwed from the transfer case like a spark plug.. Good luck and hope this helps. keep me posted, be glad to answer any question you may have.
SOURCE: 2000 chevy blazer 4X4. After driving twenty to
Are there any codes in the pcm?
There are quite a few things that could cause this;
Make sure the battery cables are tight and clean.
If you have a way to do it, need to find out what the fuel pressure is at when it is acting up.
Dose it miss at all or just loose rpm's and die, no matter what you do? (meaning can you keep it alive by pressing the gas peddle)
To me it sounds like your new fuel pump is loosing pressure while running for a while. But try and get a pressure reading and post back, that will give us something to rule out, or to address.
I think the light flicker you are talking about is just low engine rpm's?
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