89 S15 Jimmy high humidity causes problems

I have an 89 s15 jimmy and when humidity is high I get a rough idal to start but smoothes out once warmed up, also causes other problems. Appon acceleration it stumbles might be firering late or not at all, might be flooding cause there is a heavy gas smell in the exaust. The problem is intermittent and gets more persistent the longer I drive until it is constant. If I let the jimmy sit for a few hours it seems like it resets and goes back to intermittent. Here is the list of replaced things. Plugs n wires, O2 sensor, injectors, fuel filtet, rebuilt fuel pressure regulator, ICM, ignition coil, distributor, cap, button, new conectors from ICM to coil, new power conector for coil, MAP sensor, IAC and ECT. Above were replaced in groups over 5 months and at the beginning when things were replaced problem wad fixed for about 3 week till it came back. As time went on the fixed time got shorter and shorter and at the end when I replaced the aic and ect nothing changed. Somebody please help if I could do without it, it would be at the bottom of a cliff by now. :banghead:

Have you checked all grounding points. Like the grounding stap. Since high humidity, load and heat seem to be your problem my first guess youd be grounds. If that doesnt do it then fuel pump. But i am guessing grounds.

Thank you I will look at the grounds and I forgot to list that the fuel pump is new also.

Just curious if it was a grounding issue or not?