Question about 1995 Nissan Altima

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Misfires, I think? 60 mph to 5 mph

My car has this very specific habit of going from 60 mph to maybe 5 mph out of nowhere. It seems to happen most when I am just about approaching 60 MPH. The car suddenly jerks back very hard (no like a stall, but kind of) and will not accelerate until it is good and ready. Until then I am just stranded on the highway. The only thing that give me slight warning that this is about to happen is the speedometer stops working and drops to zero and the RPMs will not go above 2200, even when I have the petal to the metal. I definately can not use the air conditioning because that makes the van more "suseptible" to doing it for a greater length of time at least. This problem occurs every day, on especially hot days it happens more frequently. I live where its 103 degrees so that just adds to the problem.
The facts!!! 2001 Nissan Quest 143,000 miles Code; 6th cylender misfire, now an "unable to communicate" code. Rebuilt Trans 4 months ago. New Spark plugs, fuel filter, air filter, fuel injection sevice 3 months ago, distributer cap 1 year 4 months old, but doesn't look corroded to me. Vaccum hose is securely in place. I am desperate for any suggestions. I am so scared to drive with my kids in the car because it has gotten to the point of being dangers. Thank you for you help and God Bless!

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  • Master
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Even new plugs can be bad. Have you tried re-replacing the #6 plug? Also, if you didnt replace the wires when you replaced the plugs you could have faulty wires. The easiest way to check thewires is to start the vehicle and then 1 at a time pull tem off of the plug and place it by a metal object on the vehicle. It should have a consistent spark pattern. If it doesnt thn you need to replace the plug wire.

Posted on Jun 29, 2009

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  • Nissan Master
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I would definitely have fuel pressure checked when this starts to happen. I suspect once fuel pump heats up, it's breaking down, thus starves engine for fuel & thus sets codes for misfire as well due to lack of fuel getting to cylinders. You'll probably show proper or close to, fuel pressure when started in morning or cooled off at night, but after driving & temperature gets hot, so does fuel pump, and then it breaks down. Fuel pressure test will confirm if you can set it up to have tested at right time.

Posted on Jun 29, 2009

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