my 97 q45 stumbles

[grip1968]

I was driving home this morning and i notice my car was shanking a lil and the RPM' was going up and down a lil. I thought it was my tranny, so I check the fluid thats good. can it be anything else ? this is the first time
I never had this problem, what do I need to check or replace?

[Infinitiexpert]

Is the engine light ON? Have you done any repairs recently?

Just by what you wrote the possible causes:

Spark plugs
Air Flow meter
Air Filter

[sergey85]

agree with infinitiexpert, it sounded like it misfired. have u had a tune up done to the car recently or have u had anywork done to the car recently? how many miles u got?

[grip1968]

I never had a tune up, i no my air filter is drity, i need to change it, but I notice I put Chevron 87 gas in my car and thats when Im having this issue.

[IlovemyFX]

Your vehicle is designed and tuned to run off of 91 octane as a minimum. Consult your manual and you will find that premium fuel is not just reccommended but required. You should perform a tune up and start using 91.

[Infinitiexpert]

I agree with IlovemyFX, start by doing a tune up, or at least replaced the air filter and spark plugs.

[sergey85]

oh yeah man defiantly run it on higher octane than 87, change the filter its not much just head to your local autoparts store,and sparks, probably belts(filter is considered a tune up )

[grip1968]

Do you think it might be my knock sensors going bad??

[300zman]

Ihad that problem, turned out to be a bad fuel injector.

[sergey85]

Originally Posted by grip1968

Do you think it might be my knock sensors going bad??

if u dont have a check eengine light(if u do have autozone or advance auto parts scan it for u for free.) but dont change anything until u know. your best bet is to go ahead and do a tune up and take it from that, since u already need a tune up sparks, airfiler etc. also run some techron fuel system cleaner with premium fuel dont forget, and run that everyother tank. a few time to clean some of the gunk or carbon deposits