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Hmm...
So the way the revs fall is your only indication? What kind of truck is it? What motor? Year? How many miles?
Some motors just have so much rotating mass that it just takes them a long time to wind down. Take for example a traditional american v8. Because the way the crankshafts are designed, the crankshafts have very heavy counter weights to keep things balanced.. blah blah stuff like that.
You may be right, but I would bet that it is not running excessively rich. There are other ways to tell. Check the spark plugs for one. Also, the factory "tune" on the truck may just work that way, it may just make the revs float when you back outta the throttle. Or maybe there is another problem.
As far as tuning goes, it sounds like you just need some basic starting point info. If you want all out complete adjustability of everything, then that is called a stand alone system. Its basically ripping out the entire factory computer system and replacing it with an aftermarket one. Race car stuff. Don't do that.
Then there are what they call "piggy backs" where its basically some kind of module that either bolts up to the ecu or plugs into it somehow to reflash it.. etc.. Much cheaper and easier to work with, although in some cases less effective.
I think you may be asking a lot. Car makers dont build computers that you can "customize" ... you gotta find somebody that can crack em. Its tricky business, because if you do it wrong you can really screw stuff up. And it goes without saying, few aftermarket companys would spend time making a tuner for a car or truck that is not popular to modify for performance. And those tuners - which may be your only real option - are usually not specifically designed for fuel economy.
Hats off to you on spreading the ecomodding fever, and best of luck.
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