I just bought my rodeo on Valentines day, and the very next day the check engine light and reduced power light came on. Since I bought it "as is", it was pointless to take it back, plus when we took it to autozone and had the codes ran it showed a misfire and we "assumed" it was a coil and maybe spark plugs also. But after changing coil #6 which was bad, and checking all of the spark plugs just to find that they are brand new- still going to change them- It still misfires. It will run fine for a while, but then when you stop at a light or stop sign the reduced power light will come back on, and you can only get speed up to 20 mph, or it will cut off all together. We figured out that if you pull over, cut it off, cut it on, then off and on again it will clear reduced power light and will drive fine again. I don't know if anyone else has this problem, but I would like some insight if you have any.
Also while driving you can feel it misfiring. RPM's are really low when driving and almost at 0 when at light or stop sign.