My 99 suburban has a jerking feeling when i barely press the gas at low speeds, also when im at a certain highway speed like 90 kms i let back oon the gas on push it a little then it starts jerking..some times theres a bumpy feeling while it idles..also once in awhile it gives me a hard time starting.what could cause this?
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In the "normal" position, the transaxle shifts at lower engine speeds. The "power" position will give you better acceleration and cost you extra at the gas pump. With a check engine light coming on, yes you need to have things checked out.
Could be the fuel filter. Watch the speed it happens. IE.. Ok at 50 MPH, hit 60 MPH it starts jerking. Clogged filers will give the pressure need, just not the volume of fuel need at higher speeds.
You will need to replace the speedometer in the dash, there is another sensor inside which can not be replaced separately. this sensor actually sends the speed information to the computer.
This is a rare one and can be tricky. Since your rpm gauge rises back up when you increase your acceleration slightly but you feel no jerking of acceleration then this tells me that a speed/rpm senser either has a bad connecton or the sensor itself is going bad when the engine reaches an optimum heat while driveing on the highway. Since you feel no acceleration when you slightly press the accelerator down but yet the rpm gauge is increasing back to normal, the throttle body sensor may be compensating for the failed speed sensor/failed sensor connector. Please get your uplander diagnosed properly first to confim this.
if you don't have a gas cap on the car or if it is on too loosely then that is a possibility. Only other thing I could think of would be water in your fuel. You may try a bottle of "heat" (I think that is how you spell it) at your local auto parts store and chunk it in the gas can. if there were any problems with water that should be the cure.
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