Need a little more info please, and a clear question.
insanity
if a bee landed on your nose.
Brakes.
A bad connection would cause a forklift mast to suddenly or slowly lower. Check all your connection wires to ensure they are properly attached and working.
your fuel pump is a good place to look if its worn it will cause this type of problem
Corrupt or missing driver or failing hardware.
Check fuses
Cause it doesn't have one
Running out of gas, timing chain breaks.
water in the fuel can cause an idling motor to sputter and/or die.
Have it examined by a physician, melanoma is multicolored, and can appear quite suddenly.
System could have a humidistat installed...