I have a 2001 Chevy Impala with a 3.4L with 152,523 miles. I had the the engine fixed about 3 months ago (had the heads done, intake, water jacket, and all the gaskets replaced). Just today, the car started ticking, if you are in front of the car looking at the engine, it would be on the left hand side (or the battery side). Any ideas? Just also had the oil changed as well. Thanks for any and all help!