First post ever here. I tried to do some homework before posting, but having a terrible time getting my Blazer to start. It takes several attempts, then th RPM's are very low, then gets up to normal speed, if I'm lucky enough to get it started.
Here is what has been done recently
New fuel pump (AC Delco)
New injectors (changed the spider assy to the MFI, Thanks for the info!)
New plugs, wires, cap and rotor

The pump was very noisy, and the old injectors/regulator were leaking, hence the change.
Rechecked the fuel pressure, holds at 59 lbs for 10 minutes.

I'm currently at a loss, but thinking maybe the ignition switch?? Any suggestions?

 

That all sounds good but theres some stuff to do before you start looking at the ignition switch.
Give your MAF, if you have one, a good cleaning with Maf cleaner.
Clean TPS, IAC and entire throttle body with carb-cleaner. EGR, if you have one also.
If you have a scan tool look at air intake temp and coolant temp. They should be within three degrees at cold start. If you don't you can still test it with a multi-meter on ohm scale. This chart should work for both temp sensors.
http://i11.photobucket.com/albums/a1...nsor_Chart.gif

 

I'll get to the EGR, MAF TPS and IAC as son as I get a little break form work. I also found my battery wasn't so good this morning. Itwas low on cranking amps. Replaced the battery, and she fired up up right away.

I'm still going to clean out the parts you recommended. Thanks for helping.

 

I cleaned the throttle body, IAC MAF and replaced the TPS. I could not see any voltage swing on the TPS when checking. I did have the reference voltage. Anyway, after replacing and driving for a bit, all seems well. This morning, my baby cranked up first time. Thanks for the help!