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Engine runs rough, ocasionally misfires

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I noticed that lately my '98 Boxster started hesitating, especially at high RPM. I couldn't get it over 5500 RPM in 3rd gear, for instance.

I replaced the spark plugs and it has the same issue. If I give it gas it almost chokes and backfires. I don't have the check engine light on. Idle is fine.

I sprayed water on the coil packs while idling to see if one of them has a leak or something - I didn't notice a fluctuation in idle speed...

Any ideas?

Thanks in advance

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  • 3 weeks later...

Thanks Loren!

It seems the MAF sensor was going bad. I replaced spark plugs and coil packs (needed to, I had over 30k miles on the spark plugs and 100k, current milage, on the coil packs) - that made a small difference but did not fix the problem. I ran without the MAF for a couple of days and, for the most part, things were OK. I ordered a new MAF sensor and put it in, and so far (70 miles later) the car runs smooth, there is no hesitation, and no CEL light on.

Thanks again.

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