While going down highway (at) 70 mph, why did car just turn off?

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My 2003 chevy Silverado V6 truck turns over but will not start..it acts lik. ... iS IT HARD TO REMOVE AN OIL PAN ON A 4.3 VORTEC S-10 PICK UP TRUCK ...silverado 1500 ext. cab. my problem is while driving on the highway my truck ... mytruck then took off the terminal to see if the alternator was work and now i have no .

Chevy Silverado and GMC Sierra Stalling Problem - Car Forums at ...

forums.edmunds.com > GMC > GMC Sierra 1500

Apr 4, 2008 - 30 posts - ‎22 authors
I can feel the truck hesitate or bump while changing lanes on the highway (70-80 MPH) if it ... Now it idles ... My truck has a 4.3 with automatic. trucks runs great after about a hour it .... It will idle and drive just fine, but will simply shut down. ... the not firing problem, but shuts off after it finally decides to start. Chevy Silverado and GMC Sierra Gasoline Engine ...
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You are fortunate that the engine still cranks. If it overheated when it shut down it is possible that some of the electrical components may have been burned out.

And if you did permanent damage it is possible that now the engine is not cranking fast enough to start.

Good luck.

This may be tire noise if you are using an off road tread. it may also be that your transmission is not going into overdrive causing your rpm's to be increased.

If it's automatic it may not be selecting lower gear at lower revs.
other possibility is the engine management light is coming on.this is a yellow car icon on the sash.if this does come on then the car automatically goes into limp mode where it can't go faster than 30 mph to protect the engine.all sorts of reasons for it doing this low oil ....low oil pressure ....low brake fluid etc.get it to a garage and let then check ecu for any fault codes.but it does sound transmission related whereby the gears are fine when the revs are up but once you ease off accelerator it dies suggesting gears not dropping to lower gear or vacuum leak.

Check oil first, Low oil sensor will shut down if more than a quart low. Change fuel filter, could be fuel starvation, change the air filter. stopped up air filter will put MAF sensor out of range. PERFORM OBDII SCAN SOON.

Running at highway speed with A/C on will stress your vehicle's cooling systems as no other
combination of circumstances - so check/top up your motor oil, and check/top up your
coolant - and keep your coolant expansion/recovery tank up to the "MAX" line.
in terms of coolant mixtures, 50/50 is traditional, but the maximum coolant mixture acceptable
in a typical cooling system is actually 70% coolant to 30% (filtered/distilled) water.
With you vehicle, and your usage, you could consider
changing from the traditional 50/50 pre-mix to a 60/40 or a 70/30 ratio.
Your vehicle seems to functioning normally. Happy motoring.

Could well be that you fuel filter is plugged.

sounds like a lifter is bleeding out or starving for oil at low revs
check oil level and oil pressure
if thats good lifter or tappet clearance next to check
is engine seviced regularly?
slugde build up can cause problems also
if V6 petrol see a lot of worn valve guides causing noise worse when warm and noise comes in and out at 1200RPM
tappet clearance issue noise would be there all the time
lifter can also come and go while holding revs up

If battery has power, check if other things work or not. If you mean "won't turn over" does starter relay Click? If there is only silence its a different problem. Check the oil level, some cars will kill the ignition at any speed for low oil level. The timing belt would not stop the engine from cranking. Starter relays usually aren't fused. Check battery cables.

with a 2002 Concord 3.5 V-6, what should the rpm be at 60mph? 70 mph?

I'm not sure if the overdrive gear is lost in the tranny, but the transmission light is on.

Thanks