yep...you gotta be crazy to call em....my housemate had problem with his car starting i said its probably plugs and just needs a service in general...
he was adamant it didnt need servicing ,hadnt been done in 60,000kms or more mind you, but that it just ahd a problem starting...i told him to buy some spark plugs and i will help him replace them...
anyway wouldn't start for work one morning, called mobile mech...160$ later he had new spark plugs...
can lead a horse to water but your not allowed to drown it
probably tightened a nut that was hard to get to...