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Old August 12th, 2012, 05:44 PM   #1
GreenXJ96
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Default 1999 Jeep Grand Cherokee 4.0L

1999 Jeep Grand Cherokee 4.0L

run for 2-3 min. and start to want to stall and backfire out the intake and after it does that it start to run ok but not alot of power. it does it when cold or hot.

new tune-up, crank shaft sensor(mopar)
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Old August 19th, 2012, 10:19 PM   #2
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so nobody know???

HELP
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Old October 16th, 2012, 03:29 PM   #3
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mines the same way ive been looking at forum after forum i cant find it anyone if you find out let me know lol
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Old October 17th, 2012, 08:52 AM   #4
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I would check for any possible vac. leaks (intake) and also check your throttle position sensor. Just went through a similar problem on a friends 99 WJ with a 4.0.
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Old October 17th, 2012, 04:21 PM   #5
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mine was the upstream o2 sensor
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