1995 Chevy Lumina Runs Rough when humid or wet after warmup

Last 30K miles car runs good unless humid or raining.
Can drive about 4 miles b4 it happens then barely make 30 mph but idle is smooth. Turn off wait 30 min, can then drive all day hundreds of miles even in rain. ODB1, no codes, Just passed 4 gas w new converter, 27/20 mpg has allways ran well after waiting. New 02, map, knock module, plugs wires coilpack ignitor cts, air fuel filter, temp gage sensor, air temp sensor. Crank p/u, fuel press same w/wo problem 40psi, 35 reg unplugged 70 return pinched. Cleaned tb and egr, seems like something resets after 30 min. Seems prob in open to closed loop transition when humid or wet. Replacement cts bad? Sounds like on rev limiter when u rev it up.