I'll ask because I'm completely out of ideas, I'll try and be as extensive as possible here. I know it's long but any suggestions are much appreciated.
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1996 sport 4.0, np321, aw4.
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This happens mostly through highway use but also if I drive spirited it will happen as well. At first it isn't as noticable but you can feel it happening. What's going on is for example on the highway, I'll be driving along at 65mph and I will feel the power cut off and come back and cut off and come back. When I lose the power it lasts for about one second then comes back. If I slow down almost to a stop, it runs crappy. I can smell somthing nasty which I'm assuming is the exaust. It's strong. Somtimes after I start going again from a stop, lots of black smoke comes out of the exhost. Initially I thought oil leak so I went down and cleaned the whole area well then replicated the problem, not a spec of oil to be found anywhere in the area.
When it happens, the check engine light comes on. I pull the codes and it allways points to running rich or lean, can never make up its mind. It also finds a fault with my upstream O2 sensor, which I have replaced twice.
Also when this happens, I am usually running very hot. I have flushed my cooling system a few times since and I'm sure its not an issue with the level of coolant.
Any suggestions? I believe that's all the details, if you don't understand somthing or you need to know somthing else I can be more specific.
Thanks so much in advance!
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1996 sport 4.0, np321, aw4.
-------------------------------
This happens mostly through highway use but also if I drive spirited it will happen as well. At first it isn't as noticable but you can feel it happening. What's going on is for example on the highway, I'll be driving along at 65mph and I will feel the power cut off and come back and cut off and come back. When I lose the power it lasts for about one second then comes back. If I slow down almost to a stop, it runs crappy. I can smell somthing nasty which I'm assuming is the exaust. It's strong. Somtimes after I start going again from a stop, lots of black smoke comes out of the exhost. Initially I thought oil leak so I went down and cleaned the whole area well then replicated the problem, not a spec of oil to be found anywhere in the area.
When it happens, the check engine light comes on. I pull the codes and it allways points to running rich or lean, can never make up its mind. It also finds a fault with my upstream O2 sensor, which I have replaced twice.
Also when this happens, I am usually running very hot. I have flushed my cooling system a few times since and I'm sure its not an issue with the level of coolant.
Any suggestions? I believe that's all the details, if you don't understand somthing or you need to know somthing else I can be more specific.
Thanks so much in advance!