Whenever the humidity is high such as 70% early in the morning my pickup engine will not start. During the normal days the humidity is down 30% engine start in one self no problem comes through.

No this is not a "computer running a test" You need to have the fuel pressure tested when you have these no start or hard start events.

Sounds like wet or moist spark plug wires. If this also occurs during early morning high dew point humid air, then you may have spark plug wires shorting out.

Replace wires.

You may have a leaking fuel injector that is flooding the intake with fuel while it sits overnight. Try holding the throttle in the wide open position while trying to start the engine. This will allow the maximum amount of air to enter the combustion chambers. If it is a flooding problem this should get it started a little quicker. If the engine has not been tuned up recently, a new set of spark plugs could do wonders for the early morning start up. Get a premium spark plug such as NGK Iridiums. My personal preference is a plug called E3.

Without knowing where you are or the temp/humidity conditions it's a tough call.You should understand this:too much freon is just as bad as not enough when it comes to A/C performance.Have someone help with this.Run the engine at about 2,000 rpm for 4-5 minuets,A/C on,fan on high speed.On a 70-75 deg.F day with moderate humidity, I would like to see 30-35 psi low side,225-250 high side.(even 275 isn't too bad).The hotter/more humid the day,the higher both pressures will be.Holding the engine rpm while testing is very important!If you see over 40 psi low side you could be over charged.Make sure the radiator fan(s)are working properly.

Sounds like lack of lubrication on the camshaft, especially if the sound goes away after 10 sec. or so.
If you are on a cold climate, shift to a lighter oil weight, such as 5W-30. Other option is to use commonly available oil superlubricants/ additives. Origin of problem is that oil gets drained down during the night, camshaft gets dried up, and on first start in the morning, oil pump works hard to pump the heavy oil to the top of the engine. On hotter climates, some oil stays attached to the camshaft and valve lifters.

the reason it might be shifting so early is because of the gear ratio in the rear end of the truck. it is common in the 2 wheel drive basic model pickup because they were designed to work not travel.

Check for any damage to the cap or on the wiring if no damage is visable replace the cap.

HAVE THE COOLANT TEMP SENSOR CHECKED TO SEE IF IT IS FUNCTIONING PROPERLY.HOPE THIS HELPS. BEST OF LUCK. LET ME KNOW?