I have a 2013 TL with 108,000 miles. I recently changed out the MAF sensor because I had a code and even after cleaning it and resetting it still ran awful and kept stalling. I put the new MAF sensor and a new air filter too. Good improvement in performance, but not 100% so I put new NGK plugs in and ran a can of Royal Purple Max Clean through it. After all this, I'm still getting a rumbling sound at start up and a little hesitation too. Any ideas ? Thanks
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