vortex

I've been experiencing an off-idle stumble, up until about 2500 rpms recently. Sometimes, but not often, it happens in between shifts. It doesn't happen when the car is cold or warming up, only at normal operating temperature. I don't notice it at wide-open throttle, and just cruising down the highway at normal speeds I'm not noticing anything. It almost feels like its getting too much fuel off-idle. The plugs and wires were changed, new fuel filter and all the other stuff that goes with the 30K mile service about 2 months ago. The car has been tuned since the cam and other goodies. The car was running fine until about 2 weeks ago, when this misfire or whatever it was started. I was hoping someone here would have an idea as to it's cause.

Oh, by the way, it's not setting off the SES light.

HELP!
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Brad Black '99 SS Camaro M6

12.75 @ 112 - Best MPH 116

Hurst Billet+ shifter, U.S. Strange 4.10's, BMR SFCs, Granatelli LCAs, Gale Banks custom exhaust, Random Tech cats, SLP LT headers, K&N filter, MTI lid, LS6 intake, Comp 216/220 cam, JPR stage 1 heads, EBC rotors & Greenstuff pads, ROH RT triple chrome wheels (18x9 front, 18x10 rear) riding on Kumho Ecsta MX's (GREAT tires!!)

VIP1

It sounds like it could be an O2 sensor since you already changed everything else that can be the problem.

--VIP1

Strahley

iTrader: (4)

But don't faulty 02 sensors throw codes?

VIP1

Sometimes.

vortex

Well, I definitely should have thought of that. I'll give it a try. I can't see it being plugs or wires because the car runs great until the computer switches over to the normal operating temperature routine. We'll see... thanks for the suggestion.