Check your catalitic converter. check the temperature pre and post converter. it should be relatively close to the same temperature. if it is hotter pre and a good bit cooler post. then your car is not able to release the exhaust and it will mak it hard to start when ot. also if it happens when it is hot outside and you run 87 octane fuel it could be vapor lock. that solution would be to run only 89 or higher.
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