2003 Murano will not respond when you step on the gas pedal for 4-5 seconds and then lunges forward quickly. When in stop and go traffic the car will not respond when you first push the gas pedal, then will lunge forward quickly. We have had this problem for 3 years and this is a serious safety concern. I cannot be certain the car will respond to the gas pedal. No one seems to know exactly what the problem is. I have heard transmission, but the transmission seems to run fine. Any advice?

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The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL THE DIAGNOSIS & TESTING IS COMPLETED.

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