Sounds like you need another mechanic who knows how to perform diagnostics.....many factors can cause this code. You've addressed a few of them (plug and coil), a competent mechanic will need to check other causes:
Faulty spark plug in cylinder 1 (DONE)
No compression in cylinder 1
Damage or excessive wear of spark plug wires and/or coils (DONE)
Faulty fuel injector
Clogged EGR valves or tubes
Burned valves
Inaccurate ignition timing
Vacuum leaks
Low fuel (rare)
Leaking from head gasket
Cracked distributor cap
Faulty camshaft sensor
Faulty crankshaft sensor
Faulty mass air flow sensor
Faulty oxygen sensor
Faulty throttle position sensor
Faulty catalytic converter
Faulty powertrain control module