When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm not sure you have anything more than the normal quirks or not. But I'd do some routine preventive maintenance items like replace the fuel filter, clean the throttle body and the MAF sensor, run a tank or 2 of either Techron fuel system cleaner or SeaFoam, consider tranny and rear axle fluid changes.
+1, my guess for the RPMs not dropping like they should could be a dirty MAF sensor.