02 4.3l v6 rwd. Whenever it is cold or humid/rainy my truck starts gets to idle the RPM drop below 500 and it stumbles and dies. I can start it up and aslong as its getting throttle its fine but even driving if i let off it will start to die out. Ive checked the fuel pressure and its normal and primes fine. There are no vacuum leaks and i replaced the fuel reg vacuum lines. Im thinking its a sensor issue, possibly maf, map or tps but not sure how to isolate to tell. Anyone have any similar issues? The cap and rotor were dry and all the plugs and wires seeem to be in good condition. Thanks!