My Rpm gage will rev up by itself off and on. Keeps sputt...

My Rpm gage will rev up by itself off and on. Keeps sputtering and then breaks down. Mechanic's Assistant: What is the make/model/year of your car? 2013 Nissan [Pathfinder](/topics-pathfinder/) Mechanic's Assistant:</...

My Rpm gage will rev up by itself off and on. Keeps sputtering and then breaks down. Mechanic's Assistant: What is the make/model/year of your car? 2013 Nissan [Pathfinder](/topics-pathfinder/) Mechanic's Assistant: Are you fixing your Pathfinder yourself? What have you tried so far? Nothing so far. Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? It gives out a weird smell like bad gas. I had thought it was [spark plugs](/topics-spark-plug-nissan/) so yes we did put new sparks plugs but that was not the problem. I was thinking someone might have put something in my gas. Or if it could be the transmission. Awhile back when i bought the car they had to put a new or used Transmission in so i am hoping thats not the issue?

Automotive Expert
Hi welcome to just Answer I am Roy hope I can help , do you have a check engine light on your dash? Let me know Thanks Roy
Automotive Expert
Okay you might have a bad sensor or base idle setting for the throttle setting. If not set correctly it can surge up and down . I would have the codes inspected firstDo you have an AutoZone close by your house they will check your codes for free

We already checked the codes and it showed spark plugs so we got new ones. all new. and that did not seem to be the problem
Automotive Expert
There is not a code for spark plugs just misfire code like p0300 did you save the codes

no i do not think so
Automotive Expert
Have you tried to use some fuel additive

Still did not work very well.
Automotive Expert
Okay if no failed sensor codes could be fuel pressure or restricted exhaust . I would drive with a scan tool attached and watch all the readings from your sensors first and check fuel pressure also

OK earlier when i was trying to put a full tank it would not allow me to go all the way full.
Automotive Expert
That could be a clogged vent in the tank vent system

Okay thankyou so much! So would I need to get a new fuel filter and get it all cleaned out
Automotive Expert
The filter is in the pump in your tankI would use a fuel pressure gauge and check your pressure first

Okay sure will
Automotive Expert
Okay let me know if you need anything Thank you

Thankyou and your welcome!
Automotive Expert
Okay have a great night Thank you Roy!

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