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rough idle...Misfire??

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Old 04-24-2011 | 07:38 PM
  #16  
wiggles's Avatar
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Joined: Dec 2010
Posts: 9,897
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From: shawnee,ks
Year: 1993
Model: Cherokee
Engine: 4.0
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Originally Posted by Bustedback
Did somebody mention throttlebody spacers?
Yes the op had a question about them
Old 04-25-2011 | 01:33 PM
  #17  
Sasquatch711's Avatar
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Joined: Dec 2010
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From: Utah
Year: 1991
Model: Cherokee
Engine: 4.0
Question followup

Bustedback. nah, the Grand Prix isn't supercharged but, it's damn nice! been trying to sell it since Dec. car market is dead around here!

I went ahead and ordered the throttle body spacer just to see what happens, Air Raid has a satisfaction guarantee, so if I feel it isn't working they'll refund me my money so, I figured why not. waiting for my new coil before I change the plugs as well as I may need to regap them to accomodate it anyway as it's output is much higher than stock so, i'll be waiting for a few days on that. but, I have cleaned the TPS and maybe I can get a used one (or two) out of the junkyard just to test before I get one from the overpriced parts store! then at least I'll have a couple of chances to test that against the original. eventually I'll have a whole new fuel system. I am going to check to see if my fuel rail is maintaining pressure as well, I don't see any gas leaks anywhere but, I dunno at this point!. I had thought about that after changing the injectors as it will usually start on the second crank but, sometimes it takes a few more. it's really not consistent that way which if the fuel system was bleeding down, I can see that happening. I had also wondered about the fuel pressure reg. causing this. any thoughts on that?
Thanks!, Jason
Old 04-25-2011 | 01:35 PM
  #18  
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Joined: Dec 2010
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From: Utah
Year: 1991
Model: Cherokee
Engine: 4.0
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Bustedback. nah, the Grand Prix isn't supercharged but, it's damn nice! been trying to sell it since Dec. car market is dead around here!

I went ahead and ordered the throttle body spacer just to see what happens, Air Raid has a satisfaction guarantee, so if I feel it isn't working they'll refund me my money so, I figured why not. waiting for my new coil before I change the plugs as well as I may need to regap them to accomodate it anyway as it's output is much higher than stock so, i'll be waiting for a few days on that. but, I have cleaned the TPS and maybe I can get a used one (or two) out of the junkyard just to test before I get one from the overpriced parts store! then at least I'll have a couple of chances to test that against the original. eventually I'll have a whole new fuel system. I am going to check to see if my fuel rail is maintaining pressure as well, I don't see any gas leaks anywhere but, I dunno at this point!. I had thought about that after changing the injectors as it will usually start on the second crank but, sometimes it takes a few more. it's really not consistent that way which if the fuel system was bleeding down, I can see that happening. I had also wondered about the fuel pressure reg. causing this. any thoughts on that?
Thanks!, Jason
Old 04-25-2011 | 02:24 PM
  #19  
spdrcr's Avatar
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Joined: Apr 2011
Posts: 20
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From: iowa
Year: 1996
Model: Grand Cherokee
Engine: 4.0
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had the same miss with my 4.0 after i put in the double platnums, changed to copper core problem solved
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