I bought a 2003 LT model about 18 months ago. In those 18 months I have had rocker arms pull out of the front head (14 months ago) and the rear head (last week). The van only has 85,000 miles on it. What a piece of junk engine. I am trading the thing off as soon as it is fixed. If anyone is thinking of buying any GM car with a 3.4L engine beware. The car I had before this one (2000 Pontiac Grand AM GT) had the 3.4L engine and it had the famous LIM gasket leak. Buyer beware!!

It would be helpful if you would explain what type of problems you experienced. I haven't heard of anything with the rocker arms.