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the 4.0 is not much to power that heavy of a vehicle (i got one in my wj, alot heavier than your zj) All i can say is try a general tune up (spark plugs, wires, air filter) and with a 10 year old engine, I would look into seafoam, works like a charm, but not more than once a year, but that would require an oil change. Check your tire pressure (low tires take more work to move). good luck
about $50-$60 can have you running great, but it is still a heavy vehicle with somewhat poor aerodynamics, so i cant promise leaps and bounds, but it could help
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[B]Rick[/B]
[SIZE="3"][B]2001 WJ Laredo 4.0[/B][/SIZE]
[SIZE="2"][B]2" BB
245/75R16 [/B][/SIZE]
[B]
[COLOR="Red"]Ron [/COLOR][COLOR="White"]Paul[/COLOR][COLOR="White"][/COLOR][/B][COLOR="Blue"] 2012[/COLOR]
"Freedoms Popular"
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Sluggish??
