Hey all...gotta question about a 94 for my grandad. when I let go of the butterfly (or let off the gas pedal) the engine goes almost into a dead stall. It idles fine, tachs up fine, but when you let off it tries to die...drags down the motor, runs off of the battery...the whole nine yards. He claims that once the truck is warm it will smoothe out and this problem goes away. Any ideas? cold start sensor? throttle position? Thanks in advance.

ckb