[djd99]

I have a 2000 S10 Blazer with 50,000 miles that did the same thing. It stopped after doing a complete engine flush. What I did was buy 5 quarts of shell brand motor oil and a cheap filter and 5 quarts of Mobil 1 syn and a AC Delco Filter. First I change my cheap Filter and oil with the shell brand. Then added the engine flush running it for 30 minutes at Idle( DO NOT REV YOUR ENGINE OR DAMAGE COULD OCCUR)......After the 30 minutes I put in 1 more shell quart to rinse any left over flush. Drain The oil... Add New AC Delco filter and Mobil1 Oil( Or what ever brand Your prefer) Most guys her Like Mobil 1 or CASTROL GTX. For added measure I put in Lucas synthetic treatment with is probaly overkill but I plan on keeping my blazer for awhile... Hope this Helps Don