1995 F-150 4.9 No START
 

Have a weak spark and wont start. Replaced coil, whole distributor, ICM, plugs and plug wires. Did TDC and still just cranks and cranks no start. What am I missing? Spark is orange when cranking not blue or purple. Please HELP !!! Tried spraying Starter fluid .. Nothing. And end of cranking seems to cough a bit Thanks