What are the best Chevrolet repair shops?
RepairPal Certified shops can diagnose and repair your 2004 Chevrolet Trailblazer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Also > IF gasoline has washed the cylinder walls clean - that will also result in low compression - IF this is the case - adding a tablespoon of lightweight oil (transmission fluid) to the cylinder being tested should bring compression readings back to normal. Now - IF after this test the compression readings are still low - THEN the timing chain might be the problem. .. We can only make suggestions here online .. *Hands-on* TESTING is the key! Good luck with it!