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Must not have been much of a mechanic. If the engine runs and sounds fine sometimes and other times it doesn't then it does not sound like a mechanical problem with the engine. Sounds more like a issue with either the ignition system or fuel system.
When you say it won't start, do you mean it cranks but won't fire, or it just won't crank? If it just won't crank, you could be having an issue with the starter relay. The often become intermittent before failure. Many owners do not know there is a starter relay because it was added as a recall item i order to protect the iginition switch from burnout. The starter relay is located in the very front of the engine compartment, just to the left of the battery, on the back side of the radiator crossmember.
by not turning over i`m guessing that you mean the engine won`t crank over,if you mean won`t start when the engine turns over then that is a different path of diagnosis.if you mean that it starts to turn crank over but stops almost immediately then this could be a weak battery,or bad starter with a bad spot in the starter,that`s why it will start sometimes and sometimes not as the starter hits and misses stopping on the bad spot.if you mean it cranks over fine but will not start then this could be a fuel pump going bad,a dirty throttle body,a bad crank of cam sensor,these usually set a code in the computer and sometimes turns on the check engine light sometimes not.you should have the computer checked for codes to see if there is any,or just a wiring problem for the ignition system
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