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The Jeep Grand Cherokee was redesigned for the 1999 model year; the 2000 models have minimal changes. This model is also known as Jeep WJ.

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I changed the head gaskets on 4.7 and it runs rough mostly low rpms

2002 Jeep changed head gaskets pit everything back together timing set right idles like it wants to die if I have my foot on gas won't die I've cleared codes and gives me new ones seems like runs likes there a vacuum leak

Update (04/03/2019)

I've check all vacuum lines and fixed bad ones

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Is there a drop power that normal.

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No it will stall out completely then when you start driving it chugs then clears up as you accelerate but when you slow Down does it again

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Sound like timing chain is off by one tooth? Compression check will tell you. If you advanced the timing all the cylinders on that side will read high pressure. If you retarded the pressure will be very low. I think that motor should be in the 140-160 range (even with lots of miles on it).

Vacuum leak?

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Henry zal eeuwig dankbaar zijn.
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