hi everyone

i bought my 2003 tl about 2 and a half months ago with 52500 miles on it.
so far i've put about 2000 miles on it. i've been noticing a real change in how my car sounds

when i first bought it used, the ignition cranking and startup would be so quite i would not notice it at all. (i remember this because i would have trouble guaging the turn in the key as not to over or undershoot the ignnition.)

about a month after i started to hear the cranking and ignition noises and it was no longer whisper quite. instead it got kinda loud. i thought it was something along the lines of dirty fuel injectors or worn spark plugsor something. so i bought ngk iridium spark plugs, replaced them and ran a bottle of valvoline fuel injection cleaner. it didnt change anyhting

now a couple weeks after doing all that, i noticed that wen i start up, the rpm jumps to 1.5 instead of the normal 750. one time it even hit 2000 rpm after ignition. it was really loud and i got pretty scared.

every time i start up in the morning, the rpm jumps so high that its like a small explosion, when it used to be INCREDIBLY quite just 2 months before.

is there anyway to get it as quite as before? or at least fix the rough startup??