Another simple thing to try is cleaning out your throttle body. pop off the intake hose, and spray some carb cleaner onto the butterfly valve and into the throttle body. Clean it up real good with a rag. Your butterfly valve could be sticking open a little.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride