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Q: How much should a timing chain replacement cost? on 1994 Buick Regal

My car has 120,000 miles on it and I've just started noticing a problem. My mechanic told me @ 6 months ago it would need to be replaced soon.
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I've had the injectors replaced @ 3 months ago and just had the platinum plugs replaced. I just started noticing that when excellerating, sometimes between 55 - 60 mph I get slight hesitation. I had my mechanic drive it on the highway and he said he could hear a "ping" sometimes which was the chain hitting against the timing chain "housing". I have a 3.8 engine.
3.8 engine, sometime a slight hesitation and shaking between 55 - 60 mph. Most of the time it's a smooth transition. Just started doing it, have had the injectors replaced @ 3 months ago and just had the platinum plugs replaced.
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