Acceleration issue sometimes

[Shaynedug]

Sometimes when i drive my 98 jeep xj and i press down on the gas the rpm meter goes up but its like its not registering and then when it does move it does a quick spurt of speed then it feels like a stall almost accept the car is still running. It usually only happens when i first start the car and begin to move. It feels like you step on the gas for a second then release it then just keep pushing down then letting go.

 

[sidewaysstarion]

Does it take a long time to start? If so then it's your fuel pump check valve, your fuel lines are draining back into the tank and when you go to take off from a start the fuel pump hasn't fully pumped all of the air out of the fuel line and it's running out of fuel for a second. I also bet that it does it most often durring times of the jeep not fully cooling off (like a trip into the liquor store.)

 

[IROCthe4.0]

Ive got a better idea. Its your idle air control motor. Its bolted to the throttle body. Replace it and your problems should go away. Common XJ thing

 

[Shaynedug]

What is considered a long time to start? Also is their anyway to check if it is the fuel pump check valve? Are the RPMs any indication of a bad fuel pump check valve? My idle RPMs are about 6-700

BTW: It is a 98 jeep cherokee

 

[DanMan2k06]

Well, on my 99 with 160k, new battery and original starter, it takes literally two full engine revolution. Less than one second. RurrrrRurrr and boom she's started. Normal idle spec is 600-800rpms.