Just a few tips from my experiences to help you. (I hope)
If you get the old parts back they might or might not be the your old parts. When you go to a shop look at the place for ‘piles’ of used parts. If there are used parts about the place be vary wary, even if the place offers used parts. Along with the old parts I use pictures of the area of repair before and after the job. It is hard to repair a car without disturbing the ‘accumulations’ of life. I have used pink or bright green (and clear 😉 ) nail polish on bolts to make sure that the something got moved. That’s how I knew they were not my parts. (thanks dad)
Learning the nomenclature of the industry is a sure way to get a bit more respect. Not just the proper names but the common names too. An after market repair manual (Haynes, Clymer’s, Chilton’s,etc) will help with this and to show you what is done to complete the repairs and compare the diagnosis. “We’ll we need to take off the bumpers to refill the headlight fluid…”, “No you don’t”, :ohmy: :blush:. I did this to some vinyl siding installers at my house one time when the smoke detector went off under my shorts and all the BS stopped. (I still wound up firing them.)
Show confidence in your ignorance. Make them explain their diagnosis and repairs to your satisfaction. Then if you say something that demonstrates some knowedge that gives them pause to think “they know more than their letting on.” Even if you let them know that you don’t know, they will know that you know you don’t know and will understand that you’re not going to blindly trust them.(thank you Ms Whitfield, 9th grade English) It will go a long way to keep them honest. This can be done with the afore mentioned manual or a quick phone call to somebody you trust. You have to make the choice as to how confrontational you need to be with the shop. I’m always pleasant on the initial visit, not so much when I have a problem.
Good mechanics understand you’re apprehensive about what they tell you. It’s a lot of money being spent. They will usually explain things with care. Dishonest mechanics are like spoiled, lying children. They are incensed that you’re questioning what they tell you. They immediately start ‘selling’ the lie.
Trust your instincts about the person you are dealing with. If you think he’s a slimeball make him prove he is not… Then still be wary. I try to always prepare for the worst, hope for the best.
As to your problem of intermittent starting, it sounds like it might be a fuel pump relay. I have seen them go bad and they displayed the same symptoms. It is a much cheaper part to throw at the problem and one you might be able to do yourself.
Hope this helps.
Jim