impatient customers

have ya ever had that customer that just needs it done right away like yesterday and he's here today? this guy comes in with a 92 crown vic. and he wants a bunch of stuff done new radio,tune-up,muffler and to fix a hessatation in the motor. so i do everything and then get to the hessation. the computer has 17 different codes in it and this is a bad sign of fauly grounds, low voltage, bad computer and another thousand other reasons. so i go through the grounds, fuses, engine managment(emissions) system. found some stuff wrong with the egr vavle and other things repaired them,cleared the computer and had the customer drive it for a few days in that time i get smacked with two complete installs, three motor jobs and a trannie and a bunch of basic maintenice stuff. that customer return a week later drops the car off with out telling me and exspect it to be worked on.already having a bad day i get the car in and the computer has all codes back in stored memory. knowing that it will need some hours of diagnouses i call the customer and tell him. he replys with i'll bring it in the morning, i said alright make sure i will keep the day open for you. so i call him just know(after doing the days work because i know better than wait on a customer) he tells me im taking it somewhere else. thats fine but just keep in mind it will not get done any sooner by doing that because the next guy will need to learn the car, that is a process that i've have already done.i guess he will learn the hard way. it is very aggervating when a customer just doesn't understand and on top of it he's an impatient one to boot. im not as mad about losing the business as bad as my ego and pride are hert. it always herts when they bring it some where else becuase of impatients or lack off faith. its great when all the praises come my way but ya get one bad job and its time to turn it in. just me venting because im furous with it and trying to be as open as possible.

i know it will pass but going over it in my mind should i have been quicker should i have played guessnoustics to keep the job! people sometimes want that and when i tell them you will have to pay for diagnoustic time because i dont play guessnoustics so we dont fix something that aint broke and waste time and money they get mad. why do i have to pay .dont you know whats wrong with the car. i wish i could fix cars (eletricaly) by sound or site. but im not a magistion so i guess i will learn in time to deal with this type of customer better in the future. thankx guys for reading i went off a little any feedback would be great.