Chevrolet Repair: Intermittent no start, chevy suburban, starter wire

Question
Hi Mark!  I am a Mercedes-Benz Mechanic and know nothing about American products.  I have a 1993 Chevy Suburban (K2500) with a 7.4 tbi in it.
Not that this is any relevance, but this problem started after a huge rain storm.  Typical scenerio is like this.  Drive it to the store (until warmed up) and go in for a few minutes.  Many times it won't start afterwards for a few minutes. This is a crank, but no start condition. When it does finally start, it runs fairly well and performs well.  I have noticed at times the tach will jump around and I can feel a miss in the engine at idle.  Then it goes away.  Any ideas?  What is a typical fuel pressure for that vehicle?  It has 123k miles on it.  I bought it second hand and really no service records.  Where is the fuel pressure port so I can measure it next time this happens?  Any other things I should look for?  It never sets the check engine light and no lights come on after restart. thanks for this sight!
:Clint
P.S. Is there a junction block where I can pick up a starter wire so I can use a bump starter to find out if I have spark at that time or not besides the starter?

Answer
Hello Clint, There isn't a port to check fuel pressure on this type of fuel injection (TBI). There should be 9 to 13 lbs of pressure. There is also not a way to crank it other then having your buddy do it. My first thought is a spark problem. Maybe the pick up coil or module inside the dist. Be sure to check all the connections to make sure they are clean and tight.

Mark