The problem is related to a computer componet. It could be the crank position, engine speed, or any other sensor. The only real way to determine the problem is to use a diagnostic computer, and those could get quite pricy(1000's to 100000's thosands of dolars). A 2003 model should still be covered by the warranty. So, bring it to your dealer. what ever your deductible is should be the only charge check your contract the deductibles run from $0 to $250 the last time I checked. Also, there may be a hidden warranty, technical service buletin(TSB), or a recall that relates to your specific problem. These are available through General Motors and dealers should have access to them. If they do not gladly give you a copy call Chevy direct. Their contact info is Chevrolet Motor Division, General Motors Division of General Motors 100 Renaissance Center Detroit, MI 48265-1000 800-222-1020
could be cheap fuel or a non-working EGR valve
No. It requires unleaded. If you put in leaded the only thing it would hurt was the catalytic converter. There is no on-highway leaded gas anymore--it's illegal to sell it. Aviation gasoline is leaded, as is racing fuel, but not road gas. The VR6 has two knock sensors on it. Knock, which is caused by running too low octane, trashes engines, and the knock sensors are there to retard the spark and get rid of knock. You won't hurt the engine by putting regular unleaded in it, but it won't run as well as it could with more-expensive gas in it.
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