1995 Chevy Blazer starting problems

When I got this Blazer I had some problems starting on damp days. To help with this, I carry a hair dryer to put on the distrubitor cap for a few minutes and it used to do the trick. It acted up about three weeks ago. Had the dryer on it for an hour and still wouldn't start. For the heck of it I sprayed some starting fluid and it started rite up and ran fine. I have sence put on a new cap, rotor, wires, plugs, and coil. While doing a fuel presure test found that it needs starting fluid to start only most of the time. Some times it will restart after you first shut it down. Let it sit over night and I need to spray. Pump presure is around 55 - 58 psi when trying to start, after starting it drops to around 50 - 53 psi. Any advice would be nice to hear about now, I love this thing and one way or another want to get it fixed. Thanks for your time. Doug