Q: I just had the transmission replaced on my 2011 Nissan Juke with 56000 miles on it and now it is idling rough intermittently and t

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My car is stopping rough on occasion, the rpms go low and the car shudders like it’s going to stall. It hasn’t stalled yet, and it’s not every time I stop, it seems to be if I have to stop a little faster and harder. It also doesn’t seem to accelerate correctly, the rpms go high even though the mph are low and the acceleration seems slower. I just had the transmission replaced after it went out on the highway. In November I had the mass air flow sensor replaced for the 3rd time in a year as well as the oxygen sensor. When the trans went out I got no warning light at all and there isn’t one going off now either.

My car has 56000 miles.
My car has an automatic transmission.

Rough idle is typically fuel and/or ignition system related assuming that there are no mechanical problems with an engine such as uneven or low cylinder compression. The problem is diagnosed, in part, using a real time scanner which reports a wide range of engine operating parameters. Parameters that are out of range will provide the clues as to what is going on. Possible causes of rough idle are vacuum leaks (including EGR system faults), air induction faults such as a stuck idle air control valve, a faulty throttle position sensor, problems with the mass air flow sensor, defective spark plugs, a weak coil(s), defective oxygen sensor(s) and quite a few other possibilities including faulty fuel injectors. High RPM’s but less than expected vehicle speed may indicate a problem with the transmission shifting (which shifting problems, in turn, can potentially be caused by a defective throttle position sensor). If you desire that the problems you are having be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a rough idle diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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