fuel problem? help please

hey guys... ive got a 90 gmc sierra.  about 2 weeks ago i changed the fuel filter, plugs, and plug wires, and the air filter.  it ran good for about a week then it all went bad.  it idles a little rough and when i am cruising at a steady speed and am just giving it a little gas it starts to kinda cut out.  i dont know what the problem is.  also sumtimes if i drive it the shut it off and try to turn it back on it barely cranks.  i have to let it sit a while then start it.  is it the ignition coil maybe?  or just a miss in the plug or wire?  help please, no one can seem to tell me what it is.

Might be dirt or "gum" in the fuel system.  Try a can of BG44K fuel conditioner...put it in about 15 gallons of gas.  Clearly the best fuel conditioner cleaner on the market.  Will clean out dirty fuel injectors and remove carbon from valves and cylinders.