Hello Forum members I have an interesting problem that I hope isn't serious.  I have a 1979 L48 with just over 60k miles.  When I bought the car, about 500 miles ago, the car would spit carbon out the exhaust pipes at initial start up.  I changed the plugs to the correct heat range, AC Delco R45TS and everything was great.  I recently went to start the car and go for a spin but the car was running really rough and would stall on me.  It seemed as though the engine was flooded because I would have to keep the pedal to the floor in order to keep the engine running to limp it back inside the garage.  I opened up the hood and was moving the spark plug wires thinking they may be loose and noticed something really strange.  The #3, 4, 6 and 7 cylinder headers were hot but the rest were slightly warm at best.  Any ideas on what's wrong?  Hopefully I just need a tune-up.  

Any and all comments and suggestions are greatly appreciated.  Thanks in advance for your replies.

Phil