I have a 2006 Nissan [Frontier](/topics-frontier/). When ...

Hi, my name is\*\*\*\*\*’ve been a technician on Just Answer since 2007 and I'll be helping you today. I'm sorry to hear you are having difficulties with your vehicle. I know how inconvenient car trouble is, but together, we will get your vehicle back up and running quickly. May I ask whom I am chatting with today?

I'm ChrisI’m Chris

HI Chris it's nice to meet you IS the check engine light on?

it is

Ok, thank you, \*\*\*\*\* \*\*\*\*\* happen to know what codes are being stored?

No I don’t. But all it does is when I start it it revs up and down

Ok thanks, There are a few things that might cause this. If at some point you can get the codes read by a parts store, it may help with the diagnosis. It's possible there is an issue with the mass airflow sensor, or a vacuum leak. To check it for a vacuum leak when the idle starts searching, spray some carb cleaner around the intake manifold with the engine running. If the idle smooths out, then there is a leak. If not, then turn the truck off and try unplugging the maf sensor, then see if the idle smooths up, if it does, then you have an issue with the maf sensor. As for the [fuel gauge](/topics-fuel-gauge-nissan/), if it was working before you replaced the fuel pump, you have a faulty fuel pump and the sending unit isn't working.

Ok I will get the codes read

Start there and let me know, the other tests I gave you are easy to do as well.

Ok I also have a 2000 f150 with 5.4. When you give it gas it fall on its face. Fuel pump has been changed, [spark plugs](/topics-spark-plug-nissan/) and coil packs. Still does the same

Sorry to say you will have to open a new question for that in the Ford category, if you would like you can request me. It's not my site, just they need a new thread because of the different model.

Oh ok

Thanks for understanding.

Yes, please do. I will do what I can to help you more.