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tune up upgrade???????????

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Old 07-27-2009, 10:38 PM
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Year: 1999
Model: Cherokee
Engine: 4.0
Default tune up upgrade???????????

does getting high end / performance electrical mods wires spark plugs cap n rotor etc etc. make a performance diffrence??? like for example these items

http://www.summitracing.com/parts/SUM-867625CR/

http://www.summitracing.com/parts/ACC-TST16/

http://www.summitracing.com/parts/BCH-4508/
Old 07-28-2009, 12:13 AM
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Model: Grand Cherokee
Engine: 4.0
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I went with the firepower ignition kit
http://www.quadratec.com/products/17610_60X_PG.htm
I could notice the change in acceleration. I have heard that the bosch plugs don't work well with jeeps. I have no resources to back it up. I had bosch platinum plugs installed and put the kit on and drove it. I then put the new E3's in and drove it again and there was a difference. This is slightly irrelevant since new plugs do not have any carbon build up. The E3's had a longer thread on it moving the spark deeper into the cylinder. I have some pics of the two side by side but they are not on this computer.
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