My son bought a 1999 Chevy Silverado 1500 LS, V-8, in January with 97,000 miles. He has put less than 1000 miles on it. It is running very roughly, blowing white smoke, and leaking water from the muffler. My husband thinks it is a cracked head. What do you think?

Sounds like a vacuum leak. Spray carb/throttle body cleaner at all fuel and air intake areas ie; intake manifold to heads, throttle body to intake, all vacuum hoses, etc. Work the throttle to keep it running or have someone inside doing it. You will know if the carb cleaner gets sucked in somewhere. That will be the location of your vacuum leak.

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Have you checked the fuel pressure regulator to see if its leaking?

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bout 500.00 dollars

check oil sensor it is probably coincedence that you fueled at the same time

Wouldn't happen to be a diesel, would it? If so, do a search on ebay for a remote fsd/pmd module. Fixed my 95 'rado (in less than 20 minutes) with a 6.5 turbo diesel -it would stall wherever and whenever it wanted, without warning.

You didn't mention the engine, so here are all options...

4.3 liter V-6 VIN "W" With Enhanced Ignition System


1996 Chevrolet C 1500 P/U 2WD
5.0 liter V-8 VIN "M OR
1996 Chevrolet C 1500 P/U 2WD
5.7 liter V-8 VIN "R "

Have you checked the u-joint yet? i had what sounds like a similar problem to yours and thats what took care of it for me...

check the connector to the fuel pump for corrosion or loose pins, the fuel pumps of newer cars and trucks are designed to last at least 100,000 miles, when the new pumps quit did u verify they had power to them?

Find out why the engine light is coming on, it is the info u probably need to fix the running rough problem. Most auto parts stores will read the codes stored in your trucks computer for free, write them down, and ask what they mean and how to correct the problem. If u need more info, return to this site w/ codes for further help.

check pressure plate.