maybe,the car is alot more smooth and quiet after the tune up but,you can still hear this noise during acceleration. Its not an obvious valve tapping,it sounds like the valves are all raddling equily during acceleration or when the idle falls back down when sitting still. the valves are adjusted properly,I'm 100% sure. I'm wondering if the cat. convertor is clogged just enough to cause a slight backpressure if you will,on the engine or the exhaust gas is not recirculating through the engine properly.