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1995 Jeep Cherokee Idles Rough

Tiny
TENNMAN1990
  • MEMBER
  • 1995 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 142,000 MILES
I just replaced my spark plugs and wires to fix a rough idle problem I was having. I replaced the plugs in the order that they were on the old cap but now the car idles harder than before. I can feel it miss a beat every few seconds or so. I checked the distributor cap and rotor. I know they need to be replaced but I dont understand how the car is running worse with new plugs. The plugs are Bosch brand and I was told equivalent to OEM. Suggestions?
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Monday, April 26th, 2010 AT 9:58 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be wrong gap and type or not firmly connected at both ends might consider changing the cap and rotor
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Tuesday, April 27th, 2010 AT 4:22 AM
Tiny
TENNMAN1990
  • MEMBER
  • 4 POSTS
I put the old plugs back in to see if I could get it to go back to acting how it had been and it is still rough. At the moment the only thing "new" on it is the wires. I know the cap and rotor could cause it to run this way but shouldn't it go back to how it was acting with the old plugs in?
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Tuesday, April 27th, 2010 AT 8:33 AM
Tiny
TENNMAN1990
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  • 4 POSTS
I also put the old wires back on and it is still bad. I am completely confused.
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Tuesday, April 27th, 2010 AT 9:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Something don't jive here-verify the firing order
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Tuesday, April 27th, 2010 AT 11:04 AM
Tiny
TENNMAN1990
  • MEMBER
  • 4 POSTS
I had a mechanic take a listen to it and he determined it was the first cylinder. I checked the plug and sure enough I cracked it at some point. Thanks for the help!
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Tuesday, April 27th, 2010 AT 4:52 PM

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