Right got a perminant missfire .......

Cylinders 1,2 and 4 are 100% fine

Fault is on number 3 cylinder....

Disconnect HT lead makes no difference.

Got a good spark.
Got fuel (had injector out while cranking and ge ta good spray of fuel)
Got good compression.
Rockers are both ok on head.

But doesn't fire on that cylinder

any help much apreciated