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Sounds like a problem I am having with my 2000 5.7L Z71 Tahoe, 53000miles.
(I really think my truck is possessed, wait until you read the other problem I had 2months ago at the end of this)
I was driving from Pittsburg back to NC. I am at McD's drive through and the engine just dies, no warning whatsoever. I start it up, runs fine and continue. I drive a few hundred miles more and am pulling into a rest area parking lot at about 10mph, engine dies, again no warning. Stop the truck, put in park, and start it up. Runs fine. Continue to drive it another couple hundred miles and within 30min of home...on the highway...going 80mph...enigne dies...no warning..no power sterrring...so i carfefully coasted to the shoulder and stopped. Tried to start and it has difficulty starting, I figure..maybe slightly flooded from me pushing on the gas when it was dead. I wait 2min and start it up, it runs fine, I make it home and drive it to work the next day. No problems. Not once has a "service engine light" came on. The oil is fine, the engine temp is fine. So I take it the same engine shop that has serviced my truck before. The store owner hooked up this fancy computer and looked at the misfire history..nothing...he looked at all the readings...no a problem. So then we took it fo a 10min drive and monitor the puter....not a single problem. A couple ideas we had were inginiton coil or the plugs. The plugs are 4000 miles old ac delco plantinum. So I left the truck with the mechanic and they drove it somemore over the past 2 days and not a DAMN PROBLEM!!!!
SO here is the other problem I had 2 months ago.... I was getting misfires, service engine soon lights, and rough idling. So I took the truck to a chain mechanic shop(Merchants). They said I needed new plugs, iginition wire, distributor cap, and rotor button, and fuel system clean. 1 week and $600 later the same problems were back. I know, I got taken for a ride on that one. So I brought it back, and they said my injectors were clogged, they cleaned them at no charge. 1 week later problem is back. I then take it to a Chevy dealer and they say I need all injectors replaced and will generously do it for $1200. I say ha and no thanks. I then take it to a engine repair shop. They tell me that #1 and #2 cylinders are misfiring and the tube that goes from the injector is clogged. So they replace 2 injectors, fuel filter, clean the fuel system, and the air intake. 2 days later problem is back. I take it back to engine repair shop...Now injectors 3 and 4 are clogged. So the mechanic takes a gas sample from the tank and the clogged injector and finds SAND. So they replace all injectors, clean the fuel system, and cleaned the gas tank, replaced the fuel filter. I have no idea how the sand got in there, but the mechanic thought I was vandalized. So I got the insurance company involved and they pay for everything, even the $$ i spent at the chain mechanic shop (Merchants). So a few days later the problem comes back. I take it back , they pull the tank and still find sand stuck to the walls of the tank. So then they replace the fuel tank, fuel pump, filter, clean the fuel system again. I get it back and truck runs fine. However I did have to bring it back for a few of their human error screw ups, like bending a contact on the mass air flow sensor (which caused a service engine light), not tighening the clamps on the fuel hoses so gas leaks. SO after all that I havent had problems for a month until my trip from Pittsburg.
Sorry for the novel, but I wanted to share my bad luck. I need a break or just to get rid of this truck. The good news to this sad story is that the insurance company has paid for almost all of the SAND problem. We have no answers for this new problem. I am driving next week up to the Mtns of West Virginia, lets pray I dont have this problem!
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