wet weather no start till dry again.

I have a 98 sub. 5.7 4x4 that will not start when weather turns damp. Long rain or fog that's around for a day or so. We didn't drive it any in the rain. It just has to sit there. I have white spark, have not checked fuel pressure or anything else. I did dump a little fuel in intake, it spit a litte but no major fire. It gives a p1345 code. After getting it running I'm going to get timing set by dealer. I replaced motor about 25000 miles ago. It's been running good till about 6 months ago. I replaced the cam and crank sensors for the p1345 code, but that did not change anything. Cap, rotor, plugs and wires have about 5 to 6 thousand miles. Once it drys up outside it will run good again. I can hear the fuel pump run when key is turned on. I don't smell any gas smellI'm looking for things to check before taking it to the stealership. Ask me questions because I'm sure I forgot something. Sorry the info is so mixed up and no in any order, In-laws are trying to talk to me.

Wow. Replaced the sensors and no difference? Strange. Buy a case of 'em, maybe one will be good. And then again, maybe they're ALL good.

Did you test for voltage comin' in on the sensor harness? Did you test for continuity of the ground wire?

You can replace parts till they need a sweater in Hell, but if there ain't no voltage, you're just pissin' in the breeze.

http://dcist.com/attachments/dcist_sommer/2008_0924_gha.jpg