Nissan Repair: injectors?, altima gxe, head gasket

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