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97 Cherokee stalling and losing power and not wanting to stay cranked

Tiny
BIGHAL84
  • MEMBER
  • 1997 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
Wondering what you guys think the issue is? Sometimes it runs fine and sometimes it loses power while im driving, shuts off while idling at a red light or stop sign. Sometimes it acts like it doesnt wanna crank after it shuts off like a stutter or real rough idle so I turn the key off sit a second try again and it cranks right up. Ive been goin 40mph and lose all power in my pedal until the truck slows down enough then I can just go again. Normally it stalls at idle after it does that. Any ideas? Replaced the ignition coil yesterday has new spark plugs and wires
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Tuesday, April 7th, 2015 AT 8:09 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
This can be a couple things. To be honest, I would start by checking fuel pump pressure to see if that is where the problem is coming from unless the check engine light is on.

If the light is on, have the computer scanned to see what codes are stored and let me know what you find.
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Tuesday, April 7th, 2015 AT 8:14 AM
Tiny
BIGHAL84
  • MEMBER
  • 3 POSTS
No check engine light on should I replace the fuel pump and filter?
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Tuesday, April 7th, 2015 AT 8:16 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
No, don't replace until we know that is where the problem is coming from. It could be other things too. For example, the catalytic converter could be plugging, there could be a problem with the throttle position sensor, an issue with the idle air control valve (stalling) a vacuum leak.

Since there is no check engine light, I would start by checking fuel pump pressure. Do you need directions?
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Tuesday, April 7th, 2015 AT 8:19 AM
Tiny
BIGHAL84
  • MEMBER
  • 3 POSTS
I had it scanned my my cousin it gave us one code for an ignition coil so I replaced that yesterday still had same problems afterwords
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Tuesday, April 7th, 2015 AT 8:19 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Two things, first tell me what the code was that he found. Second, I need you to check pressure. Here are the directions:

https://www.2carpros.com/articles/fuel-pump-pressure-and-regulator-test-video-all-cars
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Tuesday, April 7th, 2015 AT 8:25 AM

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