Bought from new 99 Tahoe. Has had 2 runaway over speed events. The 2nd was yesterday. It has been having also, loss of power at time when first starting off. It goes away quickly, usually in few seconds. Hear at least one exhaust popping noise during event. Never looses power during long highway travel. Both times the runaway acceleration was after a hard acceleration. Goes into bauck ( loss of power) & then into full acceleration! last runaway required 3 key off shutdowns to relieve. Neutral caused it to rev to 5000 RPM. Brakes seem to control run away a bit at 40mph, but not down hill! we never use cruise control & it was in off position. Hard to steer of course with engine off at 40+ mph! suspect fuel injection system. Was in drive position at occurrence. First occurrence was about a month previous. It was controlled by full braking stop then. It was then only at slow speed to start. A less experienced driver on the steep hill I came up on during run away could have been killed into trees on side of hill. Ex nasa engr with only carburetor knowledge!

- Swanton, MD, USA

Went to visit inlaws in Canada for chrismas, arrived late at nite. Got up in the morning truck will not start, local mechanic diagnosed it as the anti-theft system, { passlock } he got it running and said I need to go to the nearest dealer to get it reprogrammed be fore it happens again. Next morning was going to dealer it would not start again. Three days latter it finally started. Dealer charged $330 to reprogram {passlock} two days latter when I was going home it would not start again. I haven't got it running yet. Was supposed to be back to work in Texas three days latter. I got fired, and I'm still stuck in Canada and broke now. Thank you Chevrolet!!

- Lufkin, TX, USA

When driving the vehicle there is a fuel leakage, and when stopping and taking off, consumer is not getting enough power when driving. Vehicle has been in the shop four times, and the dealer fixed the problem. But the promblem returned.

- Walnut, CA, USA