[dirtyharry]

I bought my ZL1 new two years ago and it now has 20,000 miles. Here's what I found:

Mine started this at 800 miles. It was very intermittent. I started noticing that it happened warm, cold, or during an intermittent stop. It would fire immediately and then die (run for about half a second). The subsequent starts and drives were uneventful.

I finally had my dealer look at it when it went in for a bad Onstar sensor in the mirror (3000 miles). He said they found no codes, but ran an ethanol test on the gasoline and it came in at 9%. He stated that they had seen this on a couple of other LS engines (camaros and corvettes) He suggested switching gasoline.

I was using Chevron and Shell exclusively, but the service manager (been a customer of his for 20 years) said try Exxon. Apparently, they use the least amount of ethanol in their fuel. All summer blends have ethanol, but they supposedly have the least and some research claims that they have minimal to none in their winter blends.

I went 8 months before having another episode. Since then, I have only had a handful and two were on the same tank from a Shell station I filled up at when I was low on fuel. Since the switch (over a year ago) when running Exxon, I have only had it happen once when filling up at an unfamiliar gas station.

To further validate the theory, I filled up with Valero last week and my car died today for the first time in months... It seems that it dies (on all brands) in the summer more - which validates the ethanol theory.

In 20,000 miles I had the Onstar button, and a rear license plate light bulb go out. Other than that, the car has been flawless. It has seen rain, snow (not intentional), and never given me a problem. It is 100% stock except for a K&N filter and the upsized Michelin PSS tires. Mobil 1 and filter ever 5k, Cabin air filter every 10k, and Rear diff fluid change every 10k.

I drive the piss out of it, but only when the tires are warmed up and the oil is above 150 degrees.

Hope this helps.