Probably the dumbest question ever.....so ive had a couple of the 3400 olds silhouettes. They share the same apparant model number transmission as the 3800 gps ive had. Anyway, i know the 3400 is in other gm cars like the impala. Is it possible to swap the pcm from one of the cars into the mini van?

Im guessing no, so does anyone have any experience or knowledge of some simplish things to do to the minivans to possibly liven them up or get them to the same fuel mileage the 3400 cars get if nothing else. Any kind of tuning in them? I know the van bodies are capable of near same stats as the cars as people have swapped the engines out altogether for the 3800 s/c.