Slow to start but runs fine

1999 MAZDA MIATA
184,000 MILES • 1.8L • 4 CYL • RWD • MANUAL
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TALIA
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99 Miata slow to start but once it starts it runs fine.
I recently had issues with the car not starting at all or making any sounds when I turned the key but that went away after about a week or two.
Then last week it wouldn't start at all without a jump, but all lights and interior accessories worked. It would run fine after it was jumped. I replaced the battery clamps to see if that was maybe the issue.
Now it starts but very slow and it chug-chug-chugs and when it finally turns over the rpm is high for about 30 seconds then goes back to normal. Alternator and battery are at 15 volts. not sure what I should try first. HELP!!
Apr 5, 2017 at 11:37 AM
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HMAC300
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scan for codes and check fuel pressure with a gauge I am assuming battery is in good condition and has been load tested auto parts rent the gauge but you may need an adapter. see link. this will give a good indication if anything mechanically wrong.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Apr 6, 2017 at 6:32 AM