Recently, my 1998 Nissan Altima GLE has been running poorer than i'd like, and it isnt a gradual change, it seemed to happen after I changed the spark plugs.
It has 120,000 miles and never has had a problem before.
I am having significant power loss, esp. On the highway. Where normally it runs around 2.5k RPMs at 70mph, it now run at 3k. Not to mention accelerating to merge onto the interstate often redlines it.
My service engine light is not on, so I have nothing to go off of there. I did an oil change, sparkplug and sparkplug wire replacement. I also replaced the top O2 sensor but could not get the bottom, I did this mainly as preventive maintenance as my care has over 100k miles and never had them changed. Nothing seemed to help the problem.
Any suggestions would greatly help, I drive over 1000 miles every 2 weeks on long interstate stretches and cant afford to pay the gas while running at high RPMs like that.
Thank you very much to anyone who can help me.
Tuesday, January 22nd, 2019 AT 1:26 PM