Subject	a slight knock every now and then and runs extremely rough
Posted by	D.Lea on July 13, 2008 at 4:16 PM
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Message	Okay let me start from the beginning. I had to replace my injectors on my 1990 NA motor so I put the new style injectors in however I got those from an Infiniti Q45 and the upper plenum from it as well (Based on my research they do interchange) Okay here is now the problem. The motor does start up right away however it runs very rough at low rpm and does die if I don't give it any gas. Sometimes while it's just sitting there at idle the motor automatically revs high around 5k and stays there for a couple of seconds. There are times that the motor does respond to me whenever pressing on the gas but it revs slowy(misfire) or at times it wouldn't even respond at all. One day when I had to jump it my ignition coil #4 caught fire and my what appears to be my ground wire got hot. But i've already replaced them (I have 4 other spare motor parts for fun) ANY IDEAS! I would greatly appreciate it
Follow Ups	a slight knock every now and then and runs extremely rough - D.Lea 16:16:15 07/13/08 generally i would say vacuum leak on the idle issue but the - pearlyellowtt 21:29:05 07/13/08 If it's a new style lower plenum it does not line up 100% - Woody75 (Denver) 22:00:07 07/13/08 Re: If it's a new style lower plenum it does not line up 100% - D.Lea 21:24:19 07/14/08 you cant use a new style rail on an old lower manifold (n/m) - AntiHero 16:05:33 07/14/08 Re: you cant use a new style rail on an old lower manifold - D.Lea 20:03:48 07/14/08 it wont. you can send an old lower manifold to get machined - AntiHero 22:37:29 07/14/08
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