Weird stumble between 2000 and 3000 rpms.
Thread Starter
Teching In
Joined: May 2003
Posts: 17
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Weird stumble between 2000 and 3000 rpms. When I am accelerating it stumbles between 2k and 3k rpms. This happens in every gear. Worse when the car is cold, but still does it when it is warm. I changed the fuel filter, spark plugs, and I am getting an 02 sensor low voltage SES light. Could an 02 sensor be causing this? It just stumbles then goes back to normal. I cannot figure out why it would be doing this. Car has 100,000 miles on it. It is a 98Z. Anyone have any idea why it would be doing this?
Re: Weird stumble between 2000 and 3000 rpms. I have the same stumble - and my car is modified a lot more then yours. I just figured it's the milage. 70k on the car. It seems to have gone away when I did GM's engine cleaner stuff but then came back again. Trying some injector cleaner right now. It feels like something with the fuel. Maybe maf related or injector - I dunno! I pretty much gave up on it for the most part. Anyone else have this? 
Thread Starter
Teching In
Joined: May 2003
Posts: 17
Likes: 0
Re: Weird stumble between 2000 and 3000 rpms. I mean it is a pretty significant stumble especially when the car is cold. I guess it could be an injector, but how do you test which one it is? It is the weirdest feeling when it happens, I just can't figure out what the heck it is. I figured someone else on here would kinda know what could cause it, so far, on other boards as well, I get other people that have it but no solutions.
