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my truck won't start but has gas, timing, spark, and compression. don't know how to test air intake. It is cranking slow and smells like the gas isn't burning. any ideas?
If it's cranking real slow you might need a battery or you could have a bad starter. Check all your grounds in the battery circuit and make sure the terminals are clean. Try starting with a jump if you can.......
Check the starter connections at the solenoid and the starter. Make sure they are all clean and have good grounds.
Others will chime in with more ideas soon.