98 Weak Key Fob

Can anyone tell me how I can get more range with the remote key fob? I have already replaced the batteries in both fobs and I still have to
get within a few feet of the truck in order to lock or unlock the doors.
Another problem, the fob will not unlock the doors if the engine is running. A real bummer on these frosty mornings.
Thanks for any suggestion you can pass my way.
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