check for spark at plugs,coil.check you are getting fuel check ignition condensor
Check engine compression Check engine timing
engine cranks but wont start means one of these things.. Air, Fuel, Spark, or compression
Valve timing off, timing chain jump.
how does it stall if it wont start?
If this is a Power Stroke engine, the most likely cause is a faulty crankshaft position sensor.
1989 ford F250 Fuel Problems, It cranks but wont start
You are missing fuel or spark.
rpm went to zero cranks but wont start
Sounds like you have a dead battery.
Open a bit more the screw that regulates fuel input into the carburator.
the engine wont run. it cranks funny
With a fuel pressure guage connected, Key on 60-65psi any less & engine will be hard to start possibly cranks wont run. If motor starts than readings should be 54-58psi