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Appreciate the input. When this problem has occurred before, I noticed the headlights would flicker occasionally as though there is a bad connection or something. Someone told me to check the alternator out, that's my next step I think.

No, the check engine light has not come on at all. The other night, for the first time with this problem, the anti-lock brake light came on and stayed on. The next day, after being parked overnight, this light was not on anymore.

I have a 99 Tahoe police package 2WD and at times the speedometer will begin to jump wildly starting around 50-60 MPH. Below that speed, it is usually rock steady and seems accurate. Also, when it is jumping (10-20 MPH jumps!) the transmission feels as though it is shifting in/out of OD, or...