Nissan Repair: follow up, altima gxe, head gasket

Question
Expert:  Calvin Iwashita
Subject:  injectors?
Question:    i have 94 altima gxe runs rough under 3000r's after running it 15 miles or so, fuel smell in exhaust and doesn't want to start after its hot, one injector replaced 5 months ago no 4 cylinder, had a mechanic look at it said got a new injector for no 1 cylinder that was dumping fueal and it continued to dump fuel thru new injector, is this even possible? so he said he couldn't fix it now its in my driveway again, new cap, rotor, wires, fuel filter,new head gasket head and valves redone, new intake gasket within 5 months, cylinder 1 & 4 145, 2& 3 135, slight leak acceptable right? also had nissan dealer look at it no real answers to actually whats wrong, said to replace distributor, every one seems to have different answers to same problem
Answer:  Hi Chris -

Have a few questions -

Is the check engine light on?

Check the spark plugs, are all the plug electrodes black, or only certain ones?

Have you also replaced the igniton module in the distributor?

Does it run rough at idle, does it miss when under load such as traveling up a hill?

Let me know -
aloha
calvin
no check engine light, no4 not blk only gas not firing, miss on idle below aprox 2500 3000 r's, have not replaced ignition module

Answer
Chris,

I would replace the distributor.  I bet there is oil on the optics and that is screwing with fuel delivery.

Second, have a fuel injector leakdown test performed and if any are leaking again replace them.  Once one fails there are others soon to follow.