When the check engine light initially came on I had the 'applicable' sensor replaced, then a week later the light was back on. I replace the gas cap (3 times). It comes back on and per the mechanic I replace the fuel tank ( only way to get to the sensor) and fuel pump. I was able to go 5 days and guess what the light is back on. I have replaced everything I can and still the light comes on. I can't be the only one with this VERY EXPENSIVE problem. I service my vehicle routinely and overall it is in very good condition.

I have been to 3 different shops here in Raleigh NC with a check engine light on. Every one of the shops have told me I have a cylinder 6 misfire. The last shop I took it to, replaced the spark plugs, with iridium plugs, and the cylinder 6 coil, and after hundreds of dollars in parts and labor, I have the same problem. They also checked my injectors, and all of them were in working order.

I feel that General Motors should produce a massive recall on the heads on all the 4.2L engines. After extensive research, it seems that a lot of people out there have had the same problems, it may not be with cylinder 6, cause others have reported cylinder 2, 3, and 4, but its definitely a major issue.

My 2008 Trailblazer may have 196,000 miles on it, highway miles, but its in immaculate shape, and I have all my service records.The reason for the high mileage is my commute to work each day requires me to drive 100 miles round trip, and I love my truck, so selling it isn't an option.

PLEASE everyone, lets raise enough hell, and see if we can't raise some eyebrows over at General Motors. My husband and I are very hard workers, and do have savings, but we also have a 16 month old child, and to spend 2,200 dollars on my vehicle right now was unexpected, and a serious blow.