Wont start granduer 2000

Your solenoid may be on its way out its a small electronically triggered plate switch on the side of the starter motor which starts the starter motor which in turn starts your car, its a small cylinder shape, but in saying that it could be a number of things like dirty or damaged sparkplugs or injectors but you say it was jus serviced so id say they checked them another thing it could be is a minor crack in the head gasket to be able to tell if it is look at your taco wen it starts if the revs move up and down or just lower its cracked or remove a spark plug and get a compression tester (its just a hose with a gauge on the end)and screw it into the spark plug hole and check the compression of each cylinder should sit round 100 to 150 for each cylinder if its lower than that its cracked, if you need more help or info get back to me

Check solonoid on your starter motor, if necessary replace the coils in your starter motor