cylinder 4 not firing

[89mulletbird]

I've tracked down my sluggish running problem to cylinder #4 missing.
Using a laser temp gun, all header pipes at the exhaust manifold were 600 degrees F, cylinder 4 was only 300 degrees F. Either it is not getting spark or fuel. It is missing at idle and WOT.

What I've checked so far:
all cylinders compression OK
removed valve cover, all valves moving OK
new ignition mod.
new coil
new plugs
new wires
swapped injector #4 with injector #3

I still haven't fixed the issue.
Here are my possible questions:

Could the ECM be bad and not sending spark or fuel signal to cylinder #4?
Is there any way to see if injector #4 is getting signal without a oscilloscope?

Any other ideas?

 

[Blown&Injected]

noid light on #4 injector connector

If #4 is not sparking the other plug on the same coil will not fire so it seems that spark is occuring

 

[89mulletbird]

problem found

I pulled the plug #4 after screwing around with everything else all day. These were brand new plugs, it sparked when the plug was just laying on top of the valve cover. However, upon inspection I saw the ceramic was cracked. I bought a new plug and threw it in and the car ran fine......

I guess don't depend on a part working just because it is new!

I did get a new ignition, coil, vacuum block, and ECM chip at least, lol.

 

[83ttypecooled]

misfire

Hi,
Good job!The plug might have cracked during installation.Nothing like hitting on 6,especially in that sweet spot between 2500 and 4500 rpm! Have fun...